|Born||21 May 1987|
Chungbuk, South Korea
|Height||1.80 m (5 ft 11 in)|
|Men's & mixed doubles|
|Highest ranking||1 (MD 14 November 2013)|
1 (XD 8 December 2016)
|Current ranking||16 (MD), 63 (XD) (13 August 2019)|
|Revised Romanization||Go Seong-hyeon|
Ko Sung-hyun (고성현; Korean pronunciation: [ko.sʌŋ.ɦjʌŋ]; born 21 May 1987) is an internationally elite badminton player from South Korea. Ko Sung-hyun is a right-handed player who specializes in doubles events. His current partner in the men's doubles is Shin Baek-cheol.
His best performances to date were at the 2010 Hong Kong Super Series where he won the men's doubles tournament with Yoo Yeong-seong and at the 2010 Paris World Championships where they reached the round of sixteen.
In 2014, Ko won his first Superseries title in mixed doubles with Kim Ha-na at the 2014 Australian Super Series. Ko and Shin Baek-cheol won gold in 2014 BWF World Championships by defeating the first seed and also their own teammates, Lee Yong-dae and Yoo Yeon-seong. 
BWF World Championships
|2014||Ballerup Super Arena, Copenhagen, Denmark||Shin Baek-cheol|| Lee Yong-dae
|22–20, 21–23, 21–18||Gold|
|2011||Wembley Arena, London, England||Yoo Yeon-seong|| Cai Yun
|2010||Stade Pierre de Coubertin, Paris, France||Ha Jung-eun|| Zheng Bo
|21–15, 11–21, 16–21||Bronze|
Taipei, Chinese Taipei
|Lee Yong-dae|| Kim Gi-jung
|2009||Suwon Indoor Stadium,
Suwon, South Korea
|Yoo Yeon-seong|| Markis Kido
|2016||Wuhan Sports Center Gymnasium,
|Kim Ha-na|| Zhang Nan
Taipei, Chinese Taipei
|Kim Ha-na|| Zhang Nan
|Lee Yong-dae|| Vladimir Ivanov
|13–21, 21–13, 21–13||Gold|
BWF World Tour
The BWF World Tour, announced on 19 March 2017 and implemented in 2018, is a series of elite badminton tournaments, sanctioned by Badminton World Federation (BWF). The BWF World Tour are divided into six levels, namely World Tour Finals, Super 1000, Super 750, Super 500, Super 300 (part of the HSBC World Tour), and the BWF Tour Super 100.
|2019||U.S. Open||Super 300||Shin Baek-cheol|| Lee Yang
|21–13, 17–21, 6–3 Retired||Winner|
|2019||Australian Open||Super 300||Shin Baek-cheol|| Takeshi Kamura
|2018||Macau Open||Super 300||Shin Baek-cheol|| Kim Gi-jung
|21–17, 13–21, 19–21||Runner-up|
|2018||Bangka Belitung Indonesia Masters||Super 100||Shin Baek-cheol|| Chang Ko-chi
|2018||Vietnam Open||Super 100||Shin Baek-cheol|| Lee Sheng-mu
|2019||Akita Masters||Super 100||Eom Hye-won|| Kyohei Yamashita
|2019||Canada Open||Super 100||Eom Hye-won|| Guo Xinwa
|2018||Korea Masters||Super 300||Eom Hye-won|| Choi Sol-gyu
|21–12, 15–21, 21–18||Winner|
The BWF Superseries, launched on December 14, 2006 and implemented in 2007, is a series of elite badminton tournaments, sanctioned by Badminton World Federation (BWF). BWF Superseries has two level such as Superseries and Superseries Premier. A season of Superseries features twelve tournaments around the world, which introduced since 2011, with successful players invited to the Superseries Finals held at the year end.
BWF Grand Prix
|2016||Korea Masters||Kim Ha-na|| Dechapol Puavaranukroh
|2016||German Open||Kim Ha-na|| Shin Baek-cheol
|2015||Korea Masters||Kim Ha-na|| Shin Baek-cheol
|19–21, 21–17, 21–19||Winner|
|2015||Chinese Taipei Open||Kim Ha-na|| Shin Baek-cheol
|2014||German Open||Kim Ha-na|| Robert Blair
|2011||Chinese Taipei Open||Eom Hye-won|| Tontowi Ahmad
|24–22, 16–21, 21–17||Winner|
BWF International Challenge/Series
|2019||Osaka International||Shin Baek-cheol|| Kang Min-hyuk
|2018||Malaysia International||Shin Baek-cheol|| Lin Shang-kai
|2012||India International||Lee Yong-dae|| Cho Gun-woo
|2009||Korea International||Yoo Yeon-seong|| Lee Yong-dae
|19–21, 21–15, 15–21||Runner-up|
|2008||Osaka International||Kwon Yi-goo|| Keishi Kawaguchi
|2007||Korea International||Kwon Yi-goo|| Hong In-pyo
|2009||Korea International||Ha Jung-eun|| Lee Yong-dae
|14–21, 21–15, 9–21||Runner-up|
- "KO Sung Hyun Player Profile". bwf.tournamentsoftware.com. Retrieved 5 April 2016.
- "VICTOR│The Official Site – Players". Victorsport.com. 15 August 2009.
- "YONEX-SUNRISE Hong Kong Open Super Series 2010 – Organization". tournamentsoftware.com.
- "YONEX BWF WORLD CHAMPIONSHIPS 2010 – Organization". tournamentsoftware.com.
- "The Star Australian Badminton Open 2014 – Day 6: Superseries Hat-trick for Lee/Yoo". bwfbadminton.org. Retrieved 5 April 2016.
- "Li-Ning BWF World Championships 2014 – Review: Epic Battles in Ballerup". bwfbadminton.org. Retrieved 5 April 2016.
- "BWF Launches New Events Structure". Badminton World Federation. 29 November 2017.
- "Action-Packed Season Ahead!". Badminton World Federation. 15 January 2018.
- "BWF Launches Super Series". Badminton Australia. 15 December 2006.
- "Yonex All England Elevated To BWF Premier Super Series Event". Badmintonstore.com. Retrieved 29 September 2013.