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Sung Ji-hyun (; born 29 July 1991) is a South Korean badminton player from Seoul. She is an Asian Championship gold medalist, a two-time Summer Universiade gold medalist, and a World Championship bronze medalist. She was also part of South Korean teams that won the 2010 Uber Cup, 2017 Sudirman Cup, as well the team event at the 2013 and 2015 Summer Universiade. She competed at the 2010, 2014 and 2018 Asian Games, and at the 2012 and 2016 Summer Olympics. Sung is married to compatriot men's singles player, Son Wan-ho. She coaches An Se-young.
In 2012, Sung's performances at Super Series event improved, and she reached semifinals in the Indonesia Open, Singapore Open and Japan Open. She was seeded 8th at the 2012 Olympics. However, she lost to Yip Pui Yin and did not make it past the group stage. She defended her Korea Grand Prix title at the end of the year.
Sung won her first Super Series Premier title early in 2013 at her hometown, at the Korea Open. This propelled her ranking up to world no.5, the highest of her career. Sung reached the semi-finals at the All England, losing to eventual winner Tine Baun in a match that lasted for 76 minutes, with a final score of 22–24, 21–19, 19–21. She later won the 2013 Chinese Taipei Open Grand Prix Gold against Tai Tzu-ying, 21–16, 21–9. Then, she reached the finals of 2013 Denmark Super Series Premier losing to Wang Yihan in 21–16, 18–21, 20–22. In 2013 Korea Open Grand Prix Gold, she went up against compatriot Bae Youn-joo and she was beaten in 3 sets, 21–19, 15–21, 21–9.
At the 2014 German Open Grand Prix Gold, she reached the final which Sayaka Takahashi won, 21–17, 8–21, 21–12. At the 2014 Badminton Asia Championships, she became the first South Korean in 10 years to win the title, beating 1st seeded Wang Shixian 21–19, 21–15. At the 2014 Chinese Taipei Open Grand Prix Gold, she won 21–13, 21–18 against Liu Xin. She qualified for the Dubai 2014 BWF Super Series Masters Finals and lost to Tai Tzu-ying in the final, 17–21, 12–21.
She won the 2015 German Open Grand Prix Gold beating Carolina Marín 21–15, 14–21, 21–6. In 2017, she helped the South Korean national team to win the world team championships at the 2017 Sudirman Cup.
She coaches An Se-young.
| 2015 | Istora Gelora Bung Karno, Jakarta, Indonesia | Carolina Marín | 17–21, 21–15, 16–21 | Bronze |
| 2014 | Gimcheon Indoor Stadium, Gimcheon, South Korea | Wang Shixian | 21–19, 21–15 | Gold |
| 2016 | Wuhan Sports Center Gymnasium, Wuhan, China | Li Xuerui | 20–22, 11–21 | Bronze |
| 2018 | Wuhan Sports Center Gymnasium, Wuhan, China | Chen Yufei | 12–21, 13–21 | Bronze |
| 2013 | Tennis Academy, Kazan, Russia | Tai Tzu-ying | 21–16, 29–27 | Gold |
| 2015 | Hwasun Hanium Culture Sports Center, Hwasun County, South Korea | Porntip Buranaprasertsuk | 21–18, 21–19 | Gold |
Women's singles
| 2019 | Chinese Taipei Open | Super 300 | Michelle Li | 21–11, 21–9 | Winner |
| 2019 | Korea Masters | Super 300 | An Se-young | 13–21, 17–21 | Runner-up |
Women's singles
| 2010 | Korea Open | Wang Shixian | 10–21, 23–25 | Runner-up |
| 2013 | Korea Open | Wang Shixian | 21–12, 22–20 | Winner |
| 2013 | Denmark Open | Wang Yihan | 21–16, 18–21, 20–22 | Runner-up |
| 2014 | Dubai World Superseries Finals | Tai Tzu-ying | 17–21, 12–21 | Runner-up |
| 2015 | Korea Open | Wang Yihan | 21–14, 17–21, 21–18 | Winner |
| 2016 | Korea Open | Akane Yamaguchi | 22–20, 15–21, 18–21 | Runner-up |
| 2016 | Dubai World Superseries Finals | Tai Tzu-ying | 14–21, 13–21 | Runner-up |
| 2017 | Indonesia Open | Sayaka Sato | 13–21, 21–17, 14–21 | Runner-up |
Women's singles
| 2011 | Swiss Open | Saina Nehwal | 13–21, 14–21 | Runner-up |
| 2011 | Chinese Taipei Open | Ratchanok Intanon | 22–20, 21–14 | Winner |
| 2011 | Korea Masters | Han Li | 21–18, 21–16 | Winner |
| 2012 | Korea Grand Prix Gold | Aprilla Yuswandari | 21–10, 21–10 | Winner |
| 2013 | Chinese Taipei Open | Tai Tzu-ying | 21–16, 21–9 | Winner |
| 2013 | Korea Grand Prix Gold | Bae Yeon-ju | 19–21, 21–15, 9–21 | Runner-up |
| 2014 | German Open | Sayaka Takahashi | 17–21, 21–8, 12–21 | Runner-up |
| 2014 | Chinese Taipei Open | Liu Xin | 21–13, 21–18 | Winner |
| 2015 | German Open | Carolina Marín | 21–15, 14–21, 21–6 | Winner |
| 2015 | Thailand Open | Liang Xiaoyu | 21–17, 22–24, 21–8 | Winner |
| 2016 | Syed Modi International | Sayaka Sato | 12–21, 21–18, 21–18 | Winner |
| 2016 | New Zealand Open | Aya Ohori | 21–15, 21–17 | Winner |
| 2016 | Korea Masters | Lee Jang-mi | 21–8, 21–10 | Winner |
| Petya Nedelcheva | +1 |
| Chen Yufei | –9 |
| He Bingjiao | 0 |
| Li Xuerui | –12 |
| Wang Lin | 0 |
| Wang Shixian | –2 |
| Wang Xin | –1 |
| Wang Yihan | –9 |
| Zhang Yiman | +1 |
| Cheng Shao-chieh | +2 |
| Tai Tzu-ying | –10 |
| Tine Baun | –5 |
| Pi Hongyan | –1 |
| Juliane Schenk | –1 |
| Yip Pui Yin | +5 |
| Zhou Mi | 0 |
| Saina Nehwal | –6 |
| P. V. Sindhu | –1 |
| Lindaweni Fanetri | +4 |
| Gregoria Mariska Tunjung | +3 |
| Minatsu Mitani | +6 |
| Nozomi Okuhara | –2 |
| Akane Yamaguchi | 0 |
| Aya Ohori | 0 |
| Wong Mew Choo | +1 |
| An Se-young | +1 |
| Bae Yeon-ju | –1 |
| Carolina Marín | –7 |
| Porntip Buranaprasertsuk | +6 |
| Ratchanok Intanon | –3 |
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