World Championships

Sun won the 1999 IBF World Championships, beating Fung Permadi in the final. He also won a silver medal at the 1997 IBF World Championships, when in the final he was leading 10-3 in the deciding set against Peter Rasmussen despite suffering from a leg cramp, eventually losing 16-17, 18-13, 15-10.^[1]

Summer Olympics

Sun Jun competed in badminton at the 1996 Summer Olympics in men's singles. In the first round he had a bye, and in the second one he defeated Kim Hak-kyun from Korea. In round of 16 he was beaten by Alan Budikusuma 15-5, 15-6.

Sun Jun competed in badminton at the 2000 Summer Olympics in men's singles. In the first round he had a bye, and in the second round he defeated the defending Olympic champion Poul-Erik Høyer Larsen from Denmark. In the round of 16 Sun beat Richard Vaughan from Great Britain and in quarterfinals he lost to Hendrawan from Indonesia.

World Championships

Men's singles

Year	Venue	Opponent	Score	Result
1997	Scotstoun Centre, Glasgow, Scotland	Peter Rasmussen	17–16, 13–18, 10–15	Silver
1999	Brøndby Arena, Copenhagen, Denmark	Fung Permadi	15–6, 15–13	Gold

World Cup

Men's singles

Year	Venue	Opponent	Score	Result
1997	Among Rogo Sports Hall, Yogyakarta, Indonesia	Joko Suprianto	15–9, 15–8	Gold

Asian Games

Men's singles

Year	Venue	Opponent	Score	Result
1998	Thammasat Gymnasium 2, Bangkok, Thailand	Hendrawan	15–6, 12–15, 9–15	Bronze

Asian Championships

Men's singles

Year	Venue	Opponent	Score	Result
1995	Olympic Sports Center Gymnasium, Beijing, China	Park Sung-woo	8–15, 8–15	Silver
1997	Stadium Negara, Kuala Lumpur, Malaysia	Hendrawan	18–14, 8–15, 15–9	Gold

Mixed doubles

Year	Venue	Partner	Opponent	Score	Result
1998	Nimibutr Stadium, Bangkok, Thailand	Ge Fei	Kim Dong-moon Ra Kyung-min	7–15, 8–15	Silver

Asian Cup

Men's singles

Year	Venue	Opponent	Score	Result
1995	Xinxing Gymnasium, Qingdao, China	Joko Suprianto	7–15, 8–15	Silver

World Junior Championships

Boys' singles

Year	Venue	Opponent	Score	Result
1992	Istora Senayan, Jakarta, Indonesia	George Rimarcdi	15–9, 15–11	Gold

IBF World Grand Prix

The World Badminton Grand Prix sanctioned by International Badminton Federation (IBF) from 1983 to 2006.

Men's singles

Year	Tournament	Opponent	Score	Result
1994	French Open	Robert Liljequist	15–1, 16–17, 15–2	Winner
1994	Thailand Open	Joko Suprianto	15–10, 11–15, 5–15	Runner-up
1996	Dutch Open	Poul-Erik Høyer Larsen	5–9, 9–3, 9–3, 9–5	Winner
1996	Russian Open	Hu Zhilan	15–8, 15–10	Winner
1996	World Grand Prix Finals	Fung Permadi	12–15, 8–15	Runner-up
1997	All England Open	Dong Jiong	9–15, 5–15	Runner-up
1997	World Grand Prix Finals	Dong Jiong	15–9, 15–6	Winner
1998	All England Open	Ong Ewe Hock	15–1, 15–7	Winner
1998	Swiss Open	Peter Gade	12–15, 15–8, 11–15	Runner-up
1998	World Grand Prix Finals	Peter Gade	15–11, 15–8	Winner
1999	Japan Open	Peter Gade	3–15, 10–15	Runner-up

IBF International

Men's singles

Year	Tournament	Opponent	Score	Result
1992	Ten Days of Dawn	Zeng Yu		Winner
1993	Wimbledon International	Peter Knowles	15–13, 16–17, 15–8	Winner
1994	Brunei Open	Lin Liwen	15–8, 15–12	Winner

Men's doubles

Year	Tournament	Partner	Opponent	Score	Result
1992	Ten Days of Dawn	Zeng Yu	Yu Yong Zhao Zhiyong		Winner

Mixed doubles

Year	Tournament	Partner	Opponent	Score	Result
2001	Singapore International	Ge Fei	Shen Long Gao Qian	15–7, 15–11	Winner