2003 Lee participated in the OCBC/Yonex US Open, where he played in both the singles and doubles category. In both events, he was ousted in the second round.
2004 Lee started off 2004 with the French Open International, where he played in the singles, men's doubles (with
Jung Jung-young) and mixed doubles (with
Kang Hae-won). In the mixed doubles event, the pair managed to reach the semi-finals, before losing to the Russians. He participated in several other tournaments without any major results. At the Vietnam Satellite, he reached the quarter-finals in the mixed doubles category, partnering
Oh Seul-ki.
2005 Still struggling to find the right partner, he played several tournaments without getting any big results. However, he did reach the finals of the
Cheers Asian Satellite in the mixed and men's doubles category. He won the gold medals at the
Asian Junior Championships in the boys' doubles, mixed doubles and team events.
2006 In July, Lee repeated his achievements at the Asian Junior by capturing three gold medals at the
Championships held in Cheras, Kuala Lumpur, Malaysia where he played a pivotal role to secure the boys' doubles and mixed doubles victories for South Korea and frustrate Malaysia in the mixed team final. In November, Lee made another gold medal hat trick at the
World Junior Championships where he led team Korea to their first world junior championship, never dropping a single set in boys' doubles, mixed doubles and mixed team event through the tournament. Lee won two titles at the
Thailand Open in the men's doubles with
Jung Jae-sung and mixed doubles with
Ha Jung-eun. At the
Asian Games, Lee and Jung became bronze medalist after losing the semi-finals to
Luluk Hadiyanto and
Alvent Yulianto of Indonesia in the individual men's doubles event. In the team event,
South Korea lost to China in the final 2–3, thus gaining Lee a silver medal.
2007 In January, Lee and Jung participated in the
Malaysia Open, the first ever
BWF Super Series event. There they got through the first round but had to resign from the tournament due to injury. However a week later they blew away competition to take the first prize at the
Korea Open. On top of that, Lee also won the mixed doubles with
Lee Hyo-jung. Lee and Jung lost to
Hwang Ji-man and
Lee Jae-jin in the final of the
German Open; in mixed doubles Lee and Lee Hyo-jung lost to
Zheng Bo and
Gao Ling of China in the semi-finals. Zheng and Gao went on to win the tournament. At the
Swiss Open, Lee and Lee Hyo-jung took another title, winning the final in three games. For the rest of the year there were no good results in mixed doubles for Lee, mainly because he didn't participate or played with another partner. In men's doubles, he and Jung were eliminated in a disappointing second round. Lee participated in the
2007 Sudirman Cup with the South Korea team. The team lost to China in the semi-finals with a score of 0–3. In July, after a period of disappointing results in men's doubles, Lee became runner-up with Jung at the
Thailand Open, losing to Hwang Ji-man and Lee Jae-jin. Not much later, the pair went on to take the silver medal in the
2007 BWF World Championships. They were defeated in the final by
Markis Kido and
Hendra Setiawan of Indonesia, 19–21, 19–21. In mixed doubles, Lee reached the third round with
Lee Hyo-jung. There they lost to
Nathan Robertson and
Gail Emms of England in three games. With
Jung Jae-sung, the rest of the year also resulted in quite disappointing achievements, as he failed to pass the quarterfinals in any major events, except in the
French Open. Lee and Jung there lost to the eventual winners,
Cai Yun and
Fu Haifeng of China.
2008 To start 2008, Lee, together with Jung, disappointingly lost to an unseeded pair in the second round of the
Malaysia Open. Mixed doubles went better for Lee and Lee Hyo-jung this time, finishing as runners-up. They lost to
He Hanbin and
Yu Yang of China. In
South Korea, things went a bit better in men's doubles, achieving a quarterfinal. Lee and Jung lost to runners-up Luluk Hadiyanto and Alvent Yulianto of Indonesia there, but in mixed doubles Lee and his partner won the title against
Flandy Limpele and
Vita Marissa of Indonesia. More than a month later, Lee and Jung came back with a bang to win the
2008 All England Open, beating
Choong Tan Fook and
Lee Wan Wah in a thrilling semi-final (coming back from a 16–20 deficit in the third game) and Hwang Ji-man and Lee Jae-jin, also from Korea, in the final. In mixed doubles with Lee Hyo-jung, they lost in the quarter-finals to eventual winners
Zheng Bo and
Gao Ling. A week later, Lee was victorious with Jung in the
Swiss Open too. In mixed doubles they lost against He Hanbin and Yu Yang, who went on to the semi-finals. At the
Asian Championships Lee and Jung became winners, beating
Nova Widianto and
Candra Wijaya of Indonesia in the final. Lee and Jung pair were the only ones to score a point for South Korea against China in the
Thomas Cup final, which ended in a 3–1 win for China.
2008 Olympics Not having participated in the two
Super Series events prior to the Olympics, supposedly because of their preparations for the
Summer Olympics, Lee was disappointingly knocked out in the first round in
Beijing with Jung. However, Lee and
Lee Hyo-jung upset the badminton world and went on to get the gold medal in
mixed doubles, becoming the youngest gold medalists in
Olympic badminton.
2009 Lee Yong-dae started the year brightly when he and
Jung Jae-sung won the Malaysia Open. In the Korea Open Super Series, Lee won the mixed doubles title with
Lee Hyo-jung, while he and Jung reached the final. However, as Jung had to join the military service for two months, Lee paired with
Shin Baek-cheol for the German Open and claimed the title. In the Swiss Open Super Series, Lee Yong-dae and Lee Hyo-jung reached the mixed doubles final but failed to capture the trophy as they lost to China's
Zheng Bo and
Ma Jin. A month later, they subdued teammates
Yoo Yeon-seong and
Kim Min-jung to clinch the
Asian Championships title. In the Sudirman Cup on May 10–17, Lee Yong-dae brought South Korea to the final to meet defending champion China. Lee won in both the men's doubles and mixed doubles events. However, in the final, he and Lee Hyo-jung lost to Zheng Bo and
Yu Yang, while a few hours later he and Jung Jae-sung also lost to
Cai Yun and
Fu Haifeng. China then won the cup for the third consecutive time. In June, Lee Yong-dae played in the Singapore Open Super Series, but he did not win the title. In Indonesia a week later, he reached both the finals of men's doubles and mixed doubles event. Again, he and Lee Hyo-jung were defeated by Zheng Bo and Ma Jin, the Chinese pair who beat them in Singapore semi-final. Happily, he took the men's doubles title with
Jung Jae-sung, conquering China's top pair Cai Yun and Fu Haifeng. In August, Lee Yong-dae participated in the
World Championships in [Hyderabad, India. Unfortunately, in the mixed doubles, he and Lee Hyo-jung, who were the first seeds, lost to
Thomas Laybourn and
Kamilla Rytter Juhl of Denmark in the semi-final, who later became the champions. He had a better run with Jung Jae-sung in the men's doubles, reaching the final, but lost to Chinese pair Cai and Fu. In November, after a two-month absence due to injury, Lee Yong-dae returned to play in Hong Kong Open. Though he and Lee Hyo-jung lost in the first round, he fared better in the men's doubles with Jung Jae-sung. In the final, they defeated
Lars Paaske and
Jonas Rasmussen of Denmark. Only a week later, Lee successfully defended his two titles in China Open Super Series. He and Lee Hyo-jung beat Zheng Bo and Ma Jin in the mixed doubles final. With Jung, he defeated
Koo Kien Keat and
Tan Boon Heong in men's doubles final. In December, Lee and Jung participated in
Superseries Finals in Johor Bahru, Malaysia. Unbelievably, they did not drop a single set from the group stage to the final. In the final, they outclassed Denmark's
Mathias Boe and
Carsten Mogensen, whom they had subdued in the group stage.
2010 On January 17, Lee Yong-dae successfully started the 2010 year by winning Korea Open Super Series in Seoul with Jung Jae-sung. In the final, the top seeds defeated Cai Yun and Fu Haifeng of China 21–11, 14–21, and 21–18. However, in the mixed doubles, Lee who paired with Lee Hyo-jung were subdued 13–21 and 16–21 by Chinese pair
Tao Jiaming and
Zhang Yawen in the first round. The same pair defeated Lee and Lee in the second round of
Malaysia Open a week later without a match. In March's All England Championship, Lee Yong-dae and Lee Hyo-jung reached the semi-finals, playing
Nova Widianto and
Liliyana Natsir. The third seeds lost to the Indonesian pair 16–21, 21–18, and 8–21. With Jung Jae-sung in the men's doubles, Lee only made it to the quarter-finals, defeated 18–21, 10–21 by
Xu Chen and
Guo Zhendong of China. Lee Yong-dae and Lee Hyo-jung grabbed their first title of the year in Swiss Open Super Series after subduing compatriots
Shin Baek-cheol and
Yoo Hyun-young in straight sets, 21–14 and 21–18. Lee Yong-dae was absent from the Thomas Cup due to injury. However, his comeback was successful as he and Jung Jae-sung won the first tournament they played after the injury, Chinese Taipei Grand Prix Gold. The third seeds beat compatriot Cho Gun-woo and Kwon Yi-goo. In the Asian Games in November, Lee Yong-dae and Jung Jae-sung helped South Korea men's team to reach the final. They beat Chinese Cai Yun and Fu Haifeng in the final, yet Korea was failed to win the gold medal as China downed Korea 3–1. For the individual event, Lee Yong-dae and Jung Jae-sung gained the bronze medal after beaten by Indonesia's
Markis Kido and
Hendra Setiawan in the last four.
2011 partnered with
Ha Jung-eun Lee Yong-dae started the 2011 season with a not-so-satisfying result in the
2010 Superseries Finals in Taiwan as he and Jung Jae-sung finished as runner-up. However, their disappointment disappeared after they became the first winner of
Korea Open Super Series Premier in January. In the final, they conquered top-seeded Denmark's
Mathias Boe and
Carsten Mogensen easily, 21–6 and 21–13. With the retirement of
Lee Hyo-jung, Lee has now paired with
Ha Jung-eun in the mixed doubles. They won the
US Open Grand Prix Gold in July with a 21–19, 21–13 win over fifth-seeded
Chen Hung-ling and
Cheng Wen-hsing of Chinese Taipei, also won the men's doubles with
Ko Sung-hyun beating
Howard Bach and
Tony Gunawan of United States in the final. The next week, he participated in the Canada Open at the Richmond Olympic Oval. With Ko, he won the title. However, in the mixed doubles, Lee and his partner, Ha Jung-eun, lost to qualifier
Liu Cheng and
Luo Ying in the second round. In September, Lee Yong-dae and Jung Jae-sung won
China Masters title after defeating China's Cai Yun and Fu Haifeng 21–17, 21–10. Lee also played in
Japan Open, pairing with Ko Sung-hyun again, but they lost in the quarter-finals against Indonesia's Markis Kido and Hendra Setiawan. In October, Lee Yong-dae and Jung Jae-sung once again defeated Cai Yun and Fu Haifeng 21–16, 21–17 to win
Denmark Open Super Series Premier. Lee and Jung were again victorious against Cai and Fu in three sets, 14–21 21–15 21–11, to win the
French Super Series title.
2012 Lee Yong-dae and Jung Jae-sung didn't start off the year so well with a loss in their home game at the
2012 Korea Open Super Series Premier losing to Cai Yun and Fu Haifeng in three sets, 18–21 21–17 21–19. In
German Open, Lee and Jung reached the final but lost to unseeded Chinese pair,
Hong Wei and
Shen Ye. However, they managed to win against Cai and Fu again in March to win their second
All England Open title with a 21–23, 21–9, and 21–14 victory. In June, Lee Yong-dae and Jung Jae-sung won their second
Indonesia Open title after defeating Danish Mathias Boe and Carsten Mogensen 23–21, 19–21, and 21–11. His record against the Danish players was good but unfortunately, in their last meeting in 2012 in the semi-final of
2012 Olympic Games was won by the Danish players in 3 thrilling sets, breaking Koreans' hope to take the gold medals. Instead they had to be satisfied with bronze medals. After the 2012 Olympic Games, South Korean national team coach,
Kim Joong-soo, decided to pairing Lee with
Ko Sung-hyun focusing in the men's doubles.
2013 at the
2013 French Open Lee Yong-dae started the year with his new partner
Ko Sung-hyun winning the
Korea Open against Mathias Boe and Carsten Mogensen 19–21, 21–13, 21–10. They then entered the
Malaysia Open and placed second losing to Indonesian pairs
Mohammad Ahsan and
Hendra Setiawan 15–21, 13–21. After the Malaysian Open, the pair failed to perform losing 14–21, 14–21 to
Liu Xiaolong and
Qiu Zihan of China in the quarter-finals of the German Open. A week later, the pair lost again in round one of the
All England Open to unseeded German Pair
Ingo Kindervater and
Johannes Schoettler 21–23, 18–21. At the India Open in April, the pair lost in the final to Liu Xiaolong and Qiu Zihan of China 20–22, 18–21. After a one-year partnership, Lee Yong-dae and Ko Sung-hyun split and Lee paired with current world #8 and Ko's former partner
Yoo Yeon-Seong. This partnership won two consecutive tournaments 2013 Denmark Super Series Premier and China Open.
2014 In January, Lee Yong-dae and Kim Gi-jung were banned for a year by the
BWF from playing any international tournament due to their absence during a drug test. However, after further investigation, the ban was lifted several months later due to lack of evidence and claims that their absence was due to a misunderstanding with the Badminton Association of Korea. Lee immediately returned to the badminton scene in May by contributing to the national squad at the
2014 Thomas Cup. South Korea came in second to
Malaysia in the group stage but eventually lost 2–3 to Indonesia in the quarter-finals. In June, Lee and his partner,
Yoo Yeon-Seong consecutively won 3 Superseries titles in 3 weeks which were the
Japan Open,
Indonesian Open and
Australian Open. This made the pair go up two spots in the world rankings from No. 4 to No. 2. They are currently ranking No. 1 in the world. In
2014 World Championships men's doubles final, Lee and Yoo Yeon-Seong surprisingly lost to their compatriots
Ko Sung Hyun and
Shin Baek-cheol 20–22, 23–21, 18–21. Therefore, Lee won his third silver medal in World Championships.
2015 Lee Yong-dae had a bright year in 2015 despite a slow start to the year. He won a total of 6 Superseries titles, 4 consecutively, namely Australia, Japan, Korea, Denmark, France and Hong Kong with partner Yoo Yeon Seong, and were top seeds for the Dubai Superseries finals, despite losing to Indonesian rivals Mohammad Ahsan and Hendra Setiawan in the semi-finals.
2016 Lee Yong-dae and partner Yoo Yeon-seong started off the year at the
2016 German Open Grand Prix Gold and lost to compatriots Ko Sung-hyun and Shin Baek-cheol in the finals. They reached the semi-finals at the
2016 All England Super Series Premier but suffered a shock loss to unseeded Russian pair
Vladimir Ivanov and
Ivan Sozonov, who went on to take their first Super Series title. They also reached the semi-finals stage of the
2016 Malaysia Super Series Premier and the
2016 Singapore Super Series, but were knocked out by compatriots
Kim Gi-jung and
Kim Sa-rang, and Chinese pair
Fu Haifeng and
Zhang Nan, respectively. Both pairs went on to win the tournaments. Lee and Yoo won their first title of 2016 at the
China Masters against Kim Gi-jung and Kim Sa-rang, and their second at the
Asian Championships against unseeded Chinese pairing of
Li Junhui and
Liu Yuchen. They then contested the
2016 Thomas Cup representing Korea, and won three out of four matches they played, their only loss coming from eventual finalists, Indonesia's Ahsan and Setiawan. Lee and Yoo then won their first Superseries title of the year, and their third in total, at the
Indonesia Open, beating China's fifth seeds
Chai Biao and
Hong Wei in the final. They represented Korea at the
2016 Summer Olympics as the top seeds, but crashed out in the quarter-finals to unseeded Malaysian pair
Goh V Shem and
Tan Wee Kiong which was their second losses in 9 meetings with the Malaysian pair. Lee announced that he would retire following the 2016 Summer Olympics, with his last tournament being the
Korea Open in September in which he won alongside his partner Yoo Yeon-seong against the Chinese Li and Liu pair.
2018 Lee Yong-dae made a comeback in the men's doubles and partnered up with
Kim Gi-jung, and won the titles of
Spain Masters and
Macau Open.
2020 Lee began the 2020 season by winning the
Malaysia Masters with Kim Gi-jung. The duo claimed the title after beating third seeded Chinese pair
Li Junhui and
Liu Yuchen in the final in two straight games. == Personal life ==