1912–13: Maiden titles in 1914. They first played together in 1913.|alt=Lenglen and Ryan posing with rackets off the court in their tennis attire Lenglen entered her first non-handicap singles event in July 1912 at the Compiègne Championships near her hometown, her only regular event of the year. She won her debut match in the quarterfinals before losing her semifinal to
Jeanne Matthey. She also played in the singles and mixed doubles handicap events, winning both of them. When Lenglen returned to Nice in 1913, she entered a handicap doubles event in
Monte Carlo with
Elizabeth Ryan, an American who had moved to England a year earlier. Although they lost the final in three sets, Ryan became Lenglen's most frequent doubles partner and the pair never lost another match. Lenglen's success at handicap events led her to enter more regular events in the rest of 1913. She debuted at the
South of France Championships at the Nice Club in March, winning only one match. Nonetheless, when Lenglen returned to Compiègne, she won her first two regular singles titles, both within a few weeks of her 14th birthday. After losing to Matthey again at both of her events in July, the latter of which by
default, Lenglen rebounded to win titles in her last two singles events of the year.
1914: World Hard Court champion Back on the Riviera in 1914, Lenglen focused on regular events. Her victory in singles against the high-ranking British player
Ruth Winch was regarded as a huge surprise by the tennis community. However, Lenglen still struggled at larger tournaments early in the year, losing to Ryan in the quarterfinals at Monte Carlo and six-time
Wimbledon champion
Dorothea Lambert Chambers in the semifinals at the South of France Championships. In May, Lenglen was invited to enter the
French Championships, which was restricted to French players. The format gave the defending champion a bye until the final match, known as the challenge round. In that match, they faced the winner of the All Comers' competition, a standard tournament bracket for the remaining players. Lenglen won the All Comers' singles draw of six players to make it to the challenge round against
Marguerite Broquedis. Despite winning the first set, she lost the match. This was the last time in Lenglen's career she lost a completed singles match, and the only time she lost a singles final other than by default. Although she also lost the doubles challenge round at the tournament to
Blanche and
Suzanne Amblard, Lenglen won the mixed doubles title with
Max Decugis as her partner. Lenglen's performance at the French Championships set the stage for her debut at the
World Hard Court Championships, one of the major tournaments recognised by the
International Lawn Tennis Federation at the time. She won the singles final against
Germaine Golding for her first major title. The only set she lost during the event was to Suzanne Amblard in the semifinals. Her volleying ability was instrumental in defeating Amblard, and her ability to outlast Golding in long rallies gave her the advantage in the final. Lenglen also won the doubles title with Ryan over the Amblard sisters without dropping a game in the final. She finished runner-up in mixed doubles to Ryan and Decugis. Following the World Hard Court Championships, Lenglen could have debuted at
Wimbledon, but her father decided against it. He did not like her chances of defeating Lambert Chambers on grass, a surface on which she had never competed, given that she had already lost to her earlier in the year on clay.
World War I hiatus After World War I began in August 1914, tournaments ceased, interfering with Lenglen's father's plan for her to enter Wimbledon in 1915. During the war, Lenglen's family lived at their home in Nice, an area less affected by the war than northern France. Although there were no tournaments, Lenglen had plenty of opportunity to train in Nice. Soldiers came to the Riviera to temporarily avoid the war, including leading tennis players such as two-time United States national champions
R. Norris Williams and
Clarence Griffin. These players competed in charity exhibitions primarily in
Cannes to raise money for the
French Red Cross. Lenglen participated and had the opportunity to play singles matches against male players.
1919: Classic Wimbledon final Many tournaments resumed in 1919, following the end of World War I. Lenglen won nine singles titles in ten events, all four of her doubles events, and eight mixed doubles titles in ten events. She won the South of France Championships in March without dropping a game in any of her four matches. Although the French Championships and World Hard Court Championships did not return until the following year, Lenglen was able to debut at
Wimbledon in July. She won the six-round All Comers' bracket, losing only six games in the first four rounds. Her biggest challenge in the All Comers' competition was her doubles partner Ryan, who saved match points and levelled the second set of their semifinal at five games, losing only after an hour-long rain delay. Although the 20-year-old Lenglen was considered a favourite against the 40-year-old Lambert Chambers in the
challenge round, Lambert Chambers was able to trouble Lenglen with well-placed drop shots. Lenglen won the first set 10–8 after both players saved two set points. After saving two match points, Lenglen won the third set 9–7 for her first Wimbledon title. The match set the record for most games in a Wimbledon women's singles final with 44, since surpassed only by the
1970 final between
Margaret Court and
Billie Jean King. More than 8,000 people attended the match, well above the seating capacity of 3,500 on
Centre Court. Lenglen defeated Lambert Chambers and
Ethel Larcombe again in the doubles final with Ryan. She already lost to Ryan and
Randolph Lycett in her mixed doubles quarterfinal, her only loss of the year in any discipline aside from defaults.
1920: Olympic champion Lenglen began 1920 with five singles titles on the Riviera, three of which she won in lopsided finals against Ryan. However, Ryan was able to defeat Lenglen in mixed doubles at Cannes in windy conditions, Lenglen's only mixed doubles loss of the year. Although the
World Hard Court Championships returned in May, Lenglen withdrew due to illness. She recovered in time for the French Championships two weeks later and won the singles, doubles, and mixed doubles titles to complete a
triple crown. Lenglen easily made it to the challenge round in singles, where she defeated Broquedis in a rematch of the 1914 final. She won the doubles event with
Élisabeth d'Ayen and defended her mixed doubles title with Decugis, only needing to play the challenge round. Lenglen's next event was
Wimbledon. Lambert Chambers won the All Comers' final to set up a rematch of the previous year's final. Although the match was expected to be close again and began 2–2, Lenglen won ten of the last eleven games for her second consecutive Wimbledon singles title. She won the triple crown, taking the doubles with Ryan and the mixed doubles with Australian
Gerald Patterson. The doubles final was also a rematch of the previous year's final against Lambert Chambers and Larcombe, and the mixed doubles victory came against defending champions Ryan and Lycett. Lenglen's decision to partner with Patterson led to the
Fédération Française de Lawn Tennis (FFLT) threatening to not pay her expenses for the Wimbledon trip unless she partnered with a compatriot. Lenglen and her father replied by paying for the trip themselves. After Wimbledon, Lenglen won both of her events in Belgium in the lead-up to the
Olympic Games in Antwerp. At the Olympics, Lenglen won two gold medals and one bronze medal for France. She won the singles title over British player
Dorothy Holman, losing only four games in the entire event. She won mixed doubles with Decugis, overcoming an opening set loss in their quarterfinal. Lenglen partnered with d'Ayen again in the doubles event, losing their semifinal to
Kathleen McKane and
Winifred McNair in a tight match that ended 8–6 in the decisive third set. This match was Lenglen's only loss in doubles all year. Their opponents in the bronze medal match defaulted.
1921: Only singles defeat post-World War I Lenglen again dominated the tournaments on the Riviera in 1921, winning eight titles in singles, six in doubles, and seven in mixed doubles. Her only loss came in mixed doubles. She won all of her matches against Ryan, four in singles and five in mixed doubles. All of Lenglen's doubles titles on the Riviera were with Ryan. Lenglen defended her triple crown at the French Championships. Later that month, she returned to the
World Hard Court Championships, where five-time United States national singles champion
Molla Mallory was making her debut. The
United States Lawn Tennis Association (USLTA) sent Mallory and
Bill Tilden to the tournament with the hope of drawing Lenglen over to compete in the United States. Although Lenglen defeated Mallory in the final in straight sets, she trailed 2–3 in the second set before winning the last four games. Lenglen won the triple crown at the tournament, partnering with Golding in doubles and
Jacques Brugnon in mixed doubles. She then won her third consecutive
Wimbledon titles in both singles and doubles, defeating her doubles partner Ryan in a lopsided singles final. She withdrew from the mixed doubles event after her partner suffered an ankle injury. Lenglen planned to compete at the
U.S. National Championships in August to prove she deserved to be called a world champion. Due to illness delaying her trip, however, she did not make it to New York until three days before her opening match and was still sick when she arrived. After Lenglen's opening round opponent defaulted, the tournament rescheduled her
second round match against Mallory for that night to appease the large crowd that showed up to see Lenglen play. With more than 8,000 people in attendance, Mallory took a 2–0 lead in the first set before Lenglen began coughing in the third game. After losing the first set, Lenglen retired from the match two points into the second set for her only singles loss after World War I. She played only two more matches in the United States, both small exhibitions, before leaving in late September.
1922: Start of 179-match win streak During the 1922 season, Lenglen did not lose a match in any discipline other than by default. She did not return to competitive tennis until March, six months after her loss to Mallory. Lenglen's first tournament back was the South of France Championships, where she won the doubles and mixed doubles titles. She did not play the singles event and did not play singles again until a month later at the
Beausoleil Championships in Monte Carlo, where she won the title without dropping a game. This tournament began a 179-match win streak that Lenglen continued through the end of her amateur career. In the middle of the year, Lenglen won triple crowns at the
World Hard Court Championships, the French Championships, and
Wimbledon. At the first, she saved two set points in her semifinal against McKane before winning the set 10–8. Needing to play only three challenge round matches at the French, Lenglen agreed to forgo the challenge round system at Wimbledon and be included in the main draw at the request of the tournament organisers. In the singles final, she faced Mallory in a rematch of their U.S. National Championship meeting. Like in the United States, Mallory won the first two games of the final. However, Lenglen rebounded and won the next twelve games for the title. The final remains the shortest in Wimbledon history, lasting only 26 minutes.
1923: Career-best 45 titles Lenglen entered more events and won more titles in 1923 than any other year. She won all 16 of the singles events she entered, as well as 13 of 14 doubles events, and 16 of 18 mixed doubles events. Unlike previous years, she did not default a match in any discipline. At the beginning of the season, Mallory travelled to France to make her debut on the French Riviera circuit. Lenglen and Mallory had their last encounter at the South of France Championships, which Mallory entered after not performing well at her other two events on the Riviera. Lenglen defeated her without losing a game. At the same tournament, Lenglen's twelve-month win streak across all disciplines came to an end with a mixed doubles loss to Ryan and Lycett. At what was to be the last edition of the
World Hard Court Championships, Lenglen faced McKane in the final in each event, all three of which were held in the same afternoon. She defeated McKane in singles and mixed doubles, the latter of which was with
Henri Cochet as her partner for the second consecutive year. With Ryan absent, however, Lenglen partnered with Golding and lost to the British team of McKane and
Geraldine Beamish. At the French Championships, Lenglen defended her triple crown without losing a set in spite of the challenge round format being abandoned. She partnered with Brugnon in mixed doubles for the third straight year, and paired with
Julie Vlasto for the first time in doubles. She faced the most adversity in the singles final when the crowd uncharacteristically booed her for trailing 0–4 to Golding in the second set. At
Wimbledon, Lenglen won the singles and doubles titles with ease, never dropping more than three games in a set. In mixed doubles, however, she was defeated by Ryan and Lycett for the second time in the year. In September, Lenglen travelled outside of France and won titles in Belgium, Spain, and Portugal.
1924: No major titles Although Lenglen did not lose a match in any discipline in 1924 except by default, she did not win a major tournament for the first time since 1913 aside from her hiatus due to World War I. Minor illnesses limited her to three singles events on the Riviera. Lenglen played doubles more regularly, winning eight titles in both doubles and mixed doubles. In April, Lenglen travelled to Spain to compete at the Barcelona International. Although she won all three events, she contracted
jaundice soon after, preventing her from playing the French Championships. Although she had not fully recovered by
Wimbledon, she entered the tournament and won her first three singles matches without dropping a game. In the next round, however, Ryan proved to be a more difficult opponent and took the second set from Lenglen 8–6, only the third set of singles Lenglen had lost since World War I. Although Lenglen narrowly won the match, she then withdrew from the tournament following the advice of her doctor. She did not play another event the rest of the year, and in particular missed the
Olympic Games in Paris, where
Helen Wills won the women's singles event.
1925: Open French champion Lenglen returned to tennis at the Beau Site New Year Meeting in Cannes the first week of the year, winning in doubles with Ryan in her only event. She played singles at only two tournaments on the Riviera, including the South of France Championships. Her only loss during this part of the season was to Ryan and
Umberto de Morpurgo at the
Côte d'Azur Championships in Cannes. In May, Lenglen entered the
French Championships, the inaugural edition open to international players. The tournament was played at St. Cloud at the site of the defunct World Hard Court Championships. Lenglen won the triple crown and was not challenged in singles or mixed doubles. She won the singles final over McKane, losing only three games. She won the mixed doubles final with Brugnon against her doubles partner Julie Vlasto and Cochet. Although Lenglen and Vlasto lost the second set of the doubles final 9–11 to McKane and
Evelyn Colyer, they won the other two sets with ease for the title. Lenglen followed her performance at the French Championships with another triple crown at
Wimbledon. She played five singles matches and did not lose a game in the second set of any of them. The five games she dropped in total remain a record for fewest games lost in a singles title run in Wimbledon history. Her opponents included Ryan in her opening match, the defending champion McKane in the semifinals, and
Joan Fry in the final. In mixed doubles, she partnered with
Jean Borotra to defeat Ryan and de Morpurgo in the final. In doubles, Lenglen and Ryan played their last tournament together and won the title without dropping a set. During the last part of the year, Lenglen led France to a 7–4 victory in a tie against Australia, and defeated
Australasian champion
Daphne Akhurst in the final of the concurrent Deauville tournament. Later in the year, Lenglen won the doubles and mixed doubles events at the
Cromer Covered Courts Championships, the only time she played in England other than Wimbledon and her only indoor wood tournament.
1926: Match of the Century The 1926 season unexpectedly was Lenglen's last as an amateur. At the beginning of the season, three-time reigning U.S. national champion Helen Wills travelled to the French Riviera with the hope of playing a match against Lenglen. With Wills's level of stardom approaching that of Lenglen's, there was an immense amount of hype for a match between them to take place. They entered the same singles draw only once, at the Carlton Club in Cannes. When Lenglen and Wills both made the final with little opposition, the club doubled the number of seats around their main court and all three thousand seats plus standing room sold out. Spectators unable to get into the venue attempted to watch the match by climbing trees and ladders or by purchasing unofficial tickets for the windows and roofs of villas across the street. In what was called the
Match of the Century, Lenglen defeated Wills in straight sets. The first match point became chaotic when a
winner from Wills was called
out by a spectator, leading everyone but the officials to believe the match was over. Photographers captured the moment as the players shook hands at the net and the crowd began flooding the court. After clarification that the shot had been in, Wills
broke Lenglen to level the set. Despite Lenglen's winning, her reputation of being unbeatable was damaged by Wills's competitive performance. While Wills remained in France, Lenglen avoided a rematch on the Riviera. After Wills's season was marred by an appendectomy during the
French Championships, she withdrew from both Grand Slam tournaments in Europe and another match between her and Lenglen never took place. In Wills's absence, Lenglen defended all three of her titles at the French Championships with ease, defeating
Mary Browne in the singles final. She again won the doubles with Vlasto and the mixed doubles with Brugnon.
Wimbledon misunderstanding Although Lenglen was a heavy favourite at
Wimbledon with Wills not participating, she began the tournament facing two issues. She was concerned with her family's finances as her father's health was worsening, and she was not content with the FFLT wanting her to enter the doubles event with a French partner instead of her usual partner Ryan. Although Lenglen agreed to play with Vlasto as the FFLT wanted, she was unsettled by being drawn against Ryan in her opening doubles match. Lenglen's situation did not improve once the tournament began. She opened the singles event with an uncharacteristic win against Browne in which she lost five games, the same number she had lost in the entire 1925 singles event. Her
next singles match was then moved before her doubles match to accommodate the royal family, who planned to be in attendance. Wanting to play doubles first, Lenglen asked for the match to be rescheduled. Although the request was never received, she arrived at the grounds late. After Wimbledon officials confronted her in anger over keeping
Queen Mary waiting, she refused to play. The club ultimately adhered to Lenglen's wishes and rescheduled both matches with the doubles first. Nonetheless, Lenglen and Vlasto were defeated by Ryan and Browne in three sets while the crowd who typically supported Lenglen turned against her. Although she defeated
Evelyn Dewhurst in the rescheduled singles match, she then withdrew from both singles and mixed doubles, ending her last amateur tournament. ==Professional career==