2004 Summer Olympics Kuncoro played
badminton at the 2004 Summer Olympics in men's singles, defeating
Roslin Hashim of Malaysia and
Jim Ronny Andersen of Norway in the first two rounds. In the quarter-finals, Kuncoro defeated
Park Tae-sang of South Korea 15–13, 15–4. Kuncoro advanced to the semifinals, in which he lost to
Shon Seung-mo of Korea 15–6, 9–15, 15–9. He defeated
Boonsak Ponsana of
Thailand by a score of 15–11, 17–16 in the bronze medal match.
2007 BWF World Championships He became runner-up at the
2007 IBF World Championships after losing to
Lin Dan in straight sets with a score of 11–21, 20–22 in
Putra Stadium, Bukit Jalil, Malaysia. During the tournament, he defeated
Lee Chong Wei in the third round 21–9, 21–11 and
Peter Gade in the quarter-final, 22–20, 21–18. He also beat
Chen Yu in the semi-final in 3 tough games.
2009 BWF World Championships He was bronze medalist at the
2009 BWF World Championships, again losing to
Lin Dan, but this time in 3 sets, 16–21, 21–14, 15–21. En route to the semi, he beat
Lee Chong Wei (world number one) in the quarter-finals 21–16, 14–21, 21–12.
Other achievements He was runner-up in the World Junior Championships in 2000, defeated by Bao Chunlai in the final. He had good results in the Asian Championships, winning three titles. On 23 September 2007, Kuncoro won the
Chinese Taipei Open Grand Prix Gold after beating
Taufik Hidayat in the final round 18–21, 21–6, 21–13. He won the men's singles gold medal at the
SEA Games in 2003 and 2005. At the SEA Games in 2007 and 2009, Sony helped the Indonesian team win gold in the men's team event. In 2008, Kuncoro competed in
Beijing Olympic Games but he was eliminated in the quarter-finals to the second seeded
Lee Chong Wei in straight games. In June, he won the
Indonesia Open Superseries beating
Simon Santoso in the final 19–21, 21–14, 21–9 in
Istora Senayan, Jakarta. In September, Kuncoro won the
Japan Open Superseries beating
Lee Chong Wei from Malaysia in straight sets 21–17, 21–11 in the final. Also in September, he captured the
China Masters Superseries by beating China's
Chen Jin 21–19, 21–18 in the final, thus becoming the first player to win the men's singles at three consecutive "Superseries" tournaments. In 2009, his best performance in Superseries was semi-finalists in the
Indonesia Open, beaten by
Taufik Hidayat, 17–21, 14–21 and in
Denmark Open beaten by
Marc Zwiebler of Germany in three tough games. In December, he again helped Indonesia win the
SEA Games, beating Malaysia in the men teams final. He also finished second in the individual event, beaten by his teammate
Simon Santoso. In 2012, he won the men's singles title at the
Thailand Open Grand Prix Gold defeating China's Chen Yuekun in straight games, 21–17, 21–14. In the semi-final, he beat the top seed from China,
Lin Dan also in straight games, 21–17, 21–16. In 2013, he started the year by becoming the semi-finalists in
2013 Korea Open Superseries Premier, beaten by
Du Pengyu, 12–21 17–21 and in
2013 Indonesian Masters Grand Prix Gold, giving walkover to Dionysius Hayom Rumbaka. He became the finalist in
2013 Malaysia Open Superseries, beaten by
Lee Chong Wei, 7–21 8–21 and in
2013 Hong Kong Open Superseries, again beaten by
Lee Chong Wei, 13–21 9–21. In 2015, his best performance was being the champion at
2015 Chinese Taipei Masters Grand Prix after beating
Wang Tzu-wei of Chinese Taipei with score 21–13, 21–15. He also won the
2015 Indonesia International Challenge after defeat the Korean young blood
Jeon Hyeok-jin with straight games 22–20, 21–15. In 2016, he advanced to the main round of the
2016 Singapore Open Superseries after winning the qualification rounds. He later won the event after beating China's
Lin Dan in the semi-final with score 21–10, 17–21, 22–20, then South Korea's
Son Wan-ho in the final with 21–16, 13–21, 21–14. This is his first Superseries title win in six years since his victory at the same level on the stage of 2010 Singapore Open. He competed as an independent athlete and later was removed from the national training camp in mid-2014 because of injuries to his back, waist and wrist. ==Awards==