1997–99: Maiden WTA title, Newcomer of the Year in 2009. Graf won their only meeting on the WTA Tour in 1999.|alt=Clijsters walking onto Wimbledon Centre Court with Steffi Graf. As a fourteen year old, Clijsters could only enter professional tournaments through qualifying since the WTA Tour's policy did not allow players her age to receive main draw
wild cards. In August 1997, Clijsters qualified for her first main draw at her second career tournament on the lower-level
ITF Women's Circuit, which was held in the Belgian coastal town of
Koksijde. She won seven matches in total, including five in qualifying, to reach the quarterfinals. Clijsters did not enter another professional tournament until after her runner-up finish at the Wimbledon girls' singles event the following summer. Playing in Brussels in July 1998, she won both the singles and doubles events for her first career professional titles. Clijsters continued to excel at the ITF level, winning four more titles within the next year, two in both singles and doubles. Clijsters began 1999 with a WTA singles ranking of No. 420 in the world. Around this time, Belgian women's tennis was beginning to flourish. Both
Dominique Van Roost and
Sabine Appelmans had been ranked in the top 20 within the previous two years, complementing the rise of Clijsters and Henin on the junior tour. This success helped lead to the revival of the only WTA tournament in Belgium, which was relaunched as the
Flanders Women's Open in Antwerp after not being held in six years. Clijsters made her WTA debut at the tournament in May, entering the main draw as a
lucky loser after losing in the final round of qualifying. She won her first career tour-level match against
Miho Saeki and advanced to the quarterfinals, where she was defeated by top seed
Sarah Pitkowski despite holding match points. One week after Clijsters turned sixteen, she entered
Wimbledon as the youngest player in the top 200. After barely having a high enough ranking to get into the qualifying draw, she ultimately made it to the round of sixteen in her Grand Slam tournament debut. She defeated world No. 10
Amanda Coetzer in the third round and did not drop a set until losing to
Steffi Graf one round later, her only career match against her childhood idol. Clijsters also had a good showing at the
US Open, losing to the eventual champion
Serena Williams in the third round after squandering a chance to
serve for the match. Clijsters next played at the
Luxembourg Open held in the town of
Kockelscheuer just outside the capital. She won the title with relative ease in just her fourth career WTA event, taking affinity for the friendly atmosphere of the smaller tournament and the faster carpet courts. Most notably, she faced off against Van Roost in the final and only conceded four games to the top-ranked Belgian. Clijsters also made the singles final in
Bratislava at her next tournament, finishing runner-up to No. 11
Amélie Mauresmo. Nonetheless, she was able to win the doubles event with compatriot
Laurence Courtois as her partner. At the end of the season, Clijsters was named
WTA Newcomer of the Year, having risen to No. 47 in the world.
2000–02: French Open finalist, Tour champion Clijsters was unable to repeat her success at the Grand Slam tournaments in 2000, not advancing past the second round at any of the singles events. and another at the
Sparkassen Cup in Germany near the end of the season. The latter victory was Clijsters's first at a Tier II event (the second highest level tournament) and followed up a loss in another Tier II final to world No. 1
Martina Hingis earlier that month. In the middle of the year, Clijsters also finished runner-up at the
Wimbledon mixed doubles event alongside her boyfriend
Lleyton Hewitt. (
Heather Watson pictured), where Clijsters won five Luxembourg Open titles, including three consecutive from 2001 to 2003 |alt=The crowd watches Heather Watson play a point at the Kockelscheuer Sport Centre during the 2015 Luxembourg Open. At the
Indian Wells Open in early 2001, Clijsters finally defeated Hingis in her fourth meeting against the world No. 1 player to reach her first
Tier I final. After winning the first set of the final, she ended up losing in three sets to Serena Williams. The match was overshadowed by the controversy of the crowd booing Williams for her sister
Venus's late withdrawal from their semifinal, leading to both sisters
boycotting the tournament for 14 years. A few months later at the
French Open, Clijsters became the first Belgian to contest a Grand Slam singles final. She had defeated No. 16 Henin in the semifinals in their closest and highest profile match to date, coming back from a set and a break down, and also having saved three break points that would have put her behind 5–2 in the second set. The final against
Australian Open champion and world No. 4
Jennifer Capriati was an even tighter match. Playing a day after her 18th birthday, Clijsters won the first set but lost the second. After a French Open final record 22 games and 2 hours 21 minutes in total, she was defeated by Capriati 12–10 in the deciding set. Clijsters would go on to make it to at least the quarterfinals at each of the next three majors. She won three singles titles in 2001, including her second titles at both the
Luxembourg Open and the
Sparkassen Cup, to help her finish the season at No. 5 in the world. With four doubles finals in total, she was also ranked No. 15 in doubles at the end of the year. Nonetheless, she continued to rise in the rankings to No. 3 by March, her best ranking for the season. and a retirement due to injury from Venus Williams in the semifinals. Her opponent in the final was Serena Williams, who entered the match with a 56–4 record on the season and having won the last three majors of the year. Although Serena had won their first five encounters and was considered a clear favourite, Clijsters upset Serena in straight sets to win the championship. After the tournament, she said, "This is the best victory of my career."
2003: World No. 1 in singles and doubles The 2003 season was Clijsters's "
annus mirabilis". She competed in 21 singles events, reaching the semifinals in all but one of them, advancing to 15 finals, and winning nine titles. With a record of 90–12, she was the first player to accrue 90 wins since
Martina Navratilova in 1982 and the first to play more than 100 matches since
Chris Evert in 1974. Clijsters also played an extensive doubles schedule, compiling a total of 170 matches between both disciplines. She partnered with Sugiyama the entire year, winning seven titles in thirteen events. She extended her tour win streak to 17 matches—all without dropping a set Williams won the title to complete her "Serena Slam". After losing in the final at her next two tournaments, Clijsters recovered at the
Indian Wells Open to win her first Tier I title. Like in Sydney, she defeated Davenport in the final. She won another Tier I title on clay in May at the
Italian Open over No. 4 Amélie Mauresmo, who had a chance to serve for the match in the second set. At the
French Open, both Clijsters and Henin reached the final to guarantee that the winner would become the first Belgian Grand Slam singles champion. Henin had won their only meeting in a final in 2003 thus far at the
German Open, which was also their only other encounter on clay. Henin won in Paris in a lopsided affair where she only lost four games. After losing in the semifinals at
Wimbledon to Venus Williams, Clijsters rebounded to win two Tier II titles at the
Stanford Classic and the
Los Angeles Open. With the second of those titles, she attained the world No. 1 ranking, in part because the top-ranked Serena Williams had not played on tour since Wimbledon due to a knee injury. She was the first woman to become No. 1 without winning a Grand Slam singles title. Clijsters regained the top ranking in doubles the following week to become only the fifth player in WTA history to be No. 1 in singles and doubles simultaneously. Despite playing the
US Open as the top seed, Clijsters again lost to Henin in the final in straight sets. Clijsters had been regarded as the favourite entering the match because of her performance in the earlier rounds and Henin's lengthy semifinal match the previous day. The title helped Henin rise to No. 2 in the world. The last stage of the season featured Clijsters battling Henin for the top ranking. Clijsters defeated Henin in the final of the
Tennis Grand Prix in
Filderstadt to defend her title and her world No. 1 ranking. This was the eighth time in WTA history where the top two players in the world faced off for the top ranking. Although Clijsters lost the top ranking to Henin the following week, she regained it a week later by winning the
Luxembourg Open for the third year in a row. She finished her season by defending her title at the
WTA Tour Championships in the first year where the tournament switched to a round robin format in the initial stage. Clijsters swept her group of Mauresmo,
Elena Dementieva, and
Chanda Rubin. She won her semifinal against Capriati before defeating Mauresmo again for the title. With the million dollar prize, Clijsters finished the season as the tour prize money leader and became the first player to earn four million dollars in a season on the WTA Tour. Nonetheless, Henin took the year-end No. 1 ranking by improving on her performance at the event from the previous season.
Doubles: French Open and Wimbledon titles , Clijsters's doubles partner in 2003|alt=Ai Sugiyama about to serve In the early part of the season, Clijsters and Sugiyama won three titles on hard courts. They entered the French Open and Wimbledon and made it to the finals at both events. Clijsters and Sugiyama defeated the top seeds Ruano Pascual and Suarez in both finals for Clijsters's first two Grand Slam tournament titles. The French Open final was a tighter match, ending 9–7 in the third set. Despite these titles, the duo remained behind Ruano Pascual and Suarez in the rankings until August when Clijsters became world No. 1. She held the top ranking for four non-consecutive weeks. The pair were the top seeds at the US Open, but withdrew in the second round due to rain delaying Sugiyama's fourth round singles match for three days. They ended the season by finishing runners-up to Ruano Pascual and Suarez at the WTA Tour Championships. Despite Clijsters's success in 2003, she seldom played doubles during the rest of her career.
2004–05: Extended injury absence, first Grand Slam singles title Although Clijsters maintained her form into 2004, her season was ultimately marred by injuries. It was feared that she would need surgery and miss the
Australian Open after she injured her left ankle in the
Hopman Cup. Nonetheless, she competed at the event and reached the championship match without dropping a set, despite aggravating her ankle injury in the quarterfinals. Her opponent in the final was Henin and unlike their previous two Grand Slam finals, Clijsters was able to win a set. With Henin up a break at 4–3 in the third set, the
chair umpire incorrectly overruled a line call on break point that would have leveled the match. Henin ended up winning the game and the match. Clijsters said afterwards, "I'm just as disappointed as after the last two grand slam [finals], but I played a lot better this time". In February, she won her next two tournaments, including the
Diamond Games in Antwerp for her first WTA title in her home country. After Clijsters withdrew from the
Indian Wells Open following one match with a torn left wrist tendon, she only played in two more WTA events the remainder of the season. She returned to the WTA Tour six weeks later with a wrist brace, but again withdrew after one match. In June, she found out she would need surgery to remove a cyst in her wrist. As a result, she remained out until the
Hasselt Cup in Belgium where she needed to retire in her third match. There were few expectations on Clijsters entering 2005, as it still was not certain whether she would be able to play. After missing the Australian Open, she returned to the tour in February. In her second and third tournaments back, Clijsters won both Tier I events in March, the
Indian Wells Open and the
Miami Open, to become the second woman to complete the Sunshine Double after Steffi Graf in 1994 and 1996. She defeated world No. 1 Lindsay Davenport in the final of Indian Wells, as well as No. 2 Amélie Mauresmo and No. 3
Maria Sharapova in her last two matches in Miami. These titles lifted her ranking from outside the top 100 back into the top 20. Clijsters only lost one more match through early October. and her fifth
Luxembourg Open. and defeated Henin in the final of the Tier I
Canadian Open in their only meeting of the year. Clijsters's most important title of the season was the
US Open, her first Grand Slam singles title. As the fourth seed, she was not tested until the quarterfinals, when Venus Williams was two games away from defeating her at a set and a break up. Clijsters rebounded to win the match in three sets and then defeated the top seed and world No. 2 Sharapova in the semifinals, also in three sets. Despite her previous struggles in Grand Slam singles finals, she won the championship against No. 13
Mary Pierce with ease, only conceding four games. As the winner of the
US Open Series, Clijsters received double the standard amount of prize money. Her $2.2 million prize was the largest in women's sports history at the time. Clijsters's last tournament of the year was the
WTA Tour Championships. Although she had a chance to return to No. 1 if she outperformed the top-ranked Davenport, she only won one match and did not advance out of her round robin group. She was named both the
WTA Player of the Year and the
WTA Comeback Player of the Year. Despite this success, Clijsters announced in August that she was planning to retire in 2007 because of her injury troubles.
2006–07: Return to No. 1, hastened retirement The 2006 season saw a variety of injury issues for Clijsters. She only played in 14 tournaments, missing the
US Open as well as the
Fed Cup final. While she reached the semifinals at the other three Grand Slam singles events, she was unable to advance to another final. Although she recovered from those issues in time to reach the semifinals at the
Australian Open, she needed to retire from that match as well after twisting her ankle while down a break in the third set against Amélie Mauresmo. Nonetheless, with Davenport losing in the quarterfinals, Clijsters regained the No. 1 ranking. She held the top ranking through mid-March. but needed to withdraw from the
Indian Wells Open because of the same ankle injury. While she was healthy enough to play a regular schedule during the clay and grass court seasons, Henin continued her recent dominance of their rivalry over this stretch. She defeated Clijsters in the semifinals of three consecutive events, including the
French Open and
Wimbledon. During the US Open Series, Clijsters won her fourth
Stanford Classic and finished runner-up to Maria Sharapova at the Tier I
San Diego Classic. However, her summer season came to an end when she fell on her left wrist in her opening round match at the
Canadian Open. This injury kept her out until late October. She made her return at the Hasselt Cup and won her second consecutive title at the event. Clijsters entered the
WTA Tour Championships ranked No. 5 in the world, Although she lost to her group's top seed, Sharapova, she defeated
Svetlana Kuznetsova and Elena Dementieva to advance. Her season ended in the semifinals, where she lost to world No. 1 Mauresmo. Clijsters entered 2007 intending to retire at the end of the season, but only ended up playing in five tournaments due to injuries. She won her only title of the year in her first tournament, the
Sydney International. The
Australian Open was her only Grand Slam event of the season. For the second consecutive season, she lost in the semifinals, this time to top seed Sharapova. Clijsters's last tournament in Belgium was the
Diamond Games, where she finished runner-up to Mauresmo for the second year in a row. A hip injury limited Clijsters's remaining schedule. In her last two tournaments, she lost to
Li Na in the fourth round of the
Miami Open in March and qualifier
Julia Vakulenko in her opening match at the
Warsaw Open in May. Her last win was against
Samantha Stosur in Miami.
Two-year hiatus A few months after Clijsters retired, she married American basketball player
Brian Lynch. She gave birth to a daughter in early 2008, less than two months after her father
Leo Clijsters was diagnosed with lung cancer. Her father died in January 2009. Clijsters said, "The birth of Jada was the best moment of my life, but it also taught me a lesson because we knew that my Dad was terminally ill. I realised that new life had been born, but a few months later another life would disappear. It was a very intense period in our lives." Nearly two months after her father's death, it was announced that Clijsters would play in an
exhibition in May with
Tim Henman against Steffi Graf and
Andre Agassi to test the new retractable roof on
Centre Court at Wimbledon. In March 2009, Clijsters stated that she was planning to come out of retirement, motivated by returning to the "training schedule from [her] pro days" to prepare for the Wimbledon exhibition. She added that she was taking a different approach to tennis, saying, "I am looking at this as a second career, not as a comeback as I am now in a situation where not everything revolves around tennis 24 hours a day." Clijsters and Henman won the exhibition doubles, and Clijsters also defeated her idol Graf in singles. She commented, "I wanted to feel good here on court. And I've enjoyed it. This is the pleasure which was lacking at the end of my first career. But now I've got my motivation back."
2009–10: Start of second career, back-to-back US Open titles |alt=Clijsters preparing to hit souvenir tennis balls into the crowd after her first round match win With no ranking, Clijsters needed wild cards to begin her comeback. She requested and received wild cards for the
Cincinnati Open, the
Canadian Open, and the
US Open. In her return to the tour in Cincinnati, Clijsters defeated three top 20 opponents, including No. 6 Svetlana Kuznetsova, before losing to world No. 1
Dinara Safina in the quarterfinals. Nonetheless, she made it to the final, notably upsetting both Williams sisters, No. 3 Venus in the fourth round and No. 2 Serena in the semifinals. She defeated Venus in a tight third set after they split the first two 6–0. Clijsters then defeated No. 8
Caroline Wozniacki to win her second US Open championship. She became the first unseeded woman to win the title at the event, and the first mother to win a Grand Slam singles title since
Evonne Goolagong Cawley in 1980. With the title, she entered the WTA rankings at No. 19. At the end of the season, she won the WTA Comeback Player of the Year award for the second time. Clijsters planned a limited schedule for 2010 to keep her focus on her family and ended up playing just eleven tournaments. In her first event of the year, she won the
Brisbane International, narrowly defeating Henin in a third set tiebreak in Henin's first tournament back from her own retirement. She entered the
Australian Open as one of the favourites, but was upset by No. 19
Nadia Petrova in the third round, only winning one game in that loss. Clijsters did not return to the tour until March. After an early loss at the
Indian Wells Open, she won the
Miami Open for the second time. The only set she lost was in the semifinals to Henin, who she again defeated in a third set tiebreak. She only conceded three games in the final against Venus Williams. During the clay court season, Clijsters tore a muscle in her left foot, which kept her out of the French Open. Although she returned for
Wimbledon, she was upset in the quarterfinals by
Vera Zvonareva after recording another win over Henin in the previous round. In the latter half of the year, Clijsters entered only four tournaments. During the US Open Series, she won the
Cincinnati Open, the tournament where she returned from retirement a year earlier. At her next event, she was eliminated in the quarterfinals of the
Canadian Open by Zvonareva while struggling with a thigh injury. Nonetheless, Clijsters recovered to defend her title at the
US Open. In the last three rounds, she defeated three top ten players in No. 6 Samantha Stosur, No. 4 Venus Williams, and No. 8 Vera Zvonareva. Clijsters won the final over Zvonareva with ease in less than an hour. This was her third consecutive title at the US Open and the fourth consecutive time she made it to the championship match, having skipped the tournament four times since 2003. Clijsters' final event of the season was the
WTA Tour Championships, where she qualified for the seventh time. Despite a loss to Zvonareva in her last round robin match, she advanced to the knockout rounds and defeated No. 5 Stosur and world No. 1 Caroline Wozniacki for her third title at the year-end championships. Clijsters finished the season at No. 3 and was named WTA Player of the Year for the second time.
2011–12: Australian Open champion, last reign at No. 1 By the start of 2011, Clijsters knew she was planning to retire in 2012 as she did not want to be on the tour while her daughter was in school. She began the season at the
Sydney International, where she finished runner-up to Li Na in straight sets despite winning the first five games of the match. The two also met in the final of their next tournament, the
Australian Open. Although Clijsters again lost the first set, she recovered to win the championship, her fourth Grand Slam singles title and first outside of the US Open. This title would be the last of Clijsters's career. During the rest of the season, Clijsters was limited by a variety of injuries and only played five more tournaments. Aggravating that ankle injury at her next event then forced her to miss Wimbledon. Clijsters returned for the
Canadian Open, where she suffered an abdominal injury that kept her out the remainder of the season. Clijsters was unable to stay healthy in her last year on the WTA Tour. In the first week of the season, she returned to the tour for the
Brisbane International. After winning her first three matches back, she needed to retire in the semifinals due to hip spasms, a precautionary measure to prepare for the Australian Open. As the defending champion at the year's first Grand Slam event, Clijsters made it to the semifinals. Her fourth round victory came against No. 5 Li Na in a rematch of the 2011 final. She overcame rolling her ankle in the first set and saved four match points at 6–2 in the second set tiebreak to win in three sets. After Clijsters defeated world No. 1 Caroline Wozniacki in the quarterfinals, she lost to No. 3 Victoria Azarenka in another three-set match. Both her hip and ankle continued to trouble her for months after the tournament, forcing her to skip the clay court season. After playing once in March and returning in mid-June, the last WTA events of Clijsters's career were the final two Grand Slam tournaments of the season. Clijsters entered the US Open having not lost a match there since the 2003 final. She recorded her last WTA singles match win against
Victoria Duval in the first round before falling to
Laura Robson in her next match. Her career ended with a second round mixed doubles loss alongside
Bob Bryan to the eventual champions
Ekaterina Makarova and
Bruno Soares, at which point she officially retired.
2020–22: Second comeback After more than seven years of retirement, Clijsters returned to professional tennis in February 2020 at the
Dubai Tennis Championships as a wildcard. Clijsters lost to Australian Open runner-up
Garbiñe Muguruza in the opening round. She next entered the
Monterrey Open as a wildcard losing in the first round to
Johanna Konta. No tournaments were played due to the COVID-19 pandemic from March to July. Clijsters received wildcards at the inaugural
Top Seed Open in singles and doubles alongside
Sabine Lisicki. Clijsters withdrew from both singles and doubles. Clijsters next played the
US Open on a main draw wildcard losing in the first round to
Ekaterina Alexandrova. Clijsters underwent knee surgery in October and did not play another tournament in 2020. Clijsters pulled out of the
2021 Miami Open, saying she did not feel ready to compete after her surgery and contracting
COVID-19 in January. She entered the doubles draw too, the partner was
Kirsten Flipkens, but they lost in the first round. Clijsters then participated in postponed
Indian Wells Masters, drew
Kateřina Siniaková and lost in three sets in the first round. Clijsters played a number of matches for
World TeamTennis in 2021, aligned with the
New York Empire. With many tournaments having been postponed due to the
COVID-19 pandemic, Clijsters had only been able to play five matches within the two years that she had returned to the tour. On 12 April 2022, Clijsters announced that she was ending her comeback and again retiring from tennis, citing a desire to focus more on family life.
Career beyond tennis Business ventures In February 2026, Kim Clijsters became a minority investor in
Birmingham City Women FC, joining the club's ownership structure to support its strategic development. ==National representation==