Sitthikom Thammasin
Sitthikom Thammasin is a Thai badminton player. He won the men's singles title at the 2012 Singapore International Series when he was 17. Thammasin was part of the national team that clinched the bronze medal at the 2019 Sudirman Cup. His best achievement in the individual event was a champion at the BWF World Tour Super 300 2019 Macau Open.
Achievements
Southeast Asian Games
Men's singles| Year | Venue | Opponent | Score | Result |
| 2019 | Muntinlupa Sports Complex, Metro Manila, Philippines |  Lee Zii Jia | 12–21, 9–21 | Bronze |
Asian Junior Championships
Boys' singles| Year | Venue | Opponent | Score | Result |
| 2013 | Likas Indoor Stadium, Kota Kinabalu, Malaysia | Soo Teck Zhi | 14–21, 12–21 | Bronze |
BWF World Tour (2 titles)
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. The BWF World Tour are divided into six levels, namely World Tour Finals, Super 1000, Super 750, Super 500, Super 300, and the BWF Tour Super 100.Men's singles
| Year | Tournament | Level | Opponent | Score | Result |
| 2019 | Macau Open | Super 300 |  Shi Yuqi | 12–21, 21–14, 21–7 | Winner |
| 2018 | Akita Masters | Super 100 |  Ihsan Maulana Mustofa | 21–10, 21–13 | Winner |
BWF International Challenge/Series (3 titles, 1 runner-up)
Men's singles| Year | Tournament | Opponent | Score | Result |
| 2017 | Tata Open India International |  Lakshya Sen | 15–21, 21–14, 21–19 | Winner |
| 2017 | Indonesia International | Shesar Hiren Rhustavito | 8–21, 11–21 | Runner-up |
| 2013 | Smiling Fish International |  Parinyawat Thongnuam | 21–11, 21–16 | Winner |
| 2012 | Singapore International |  Ashton Chen Yong Zhao | 22–20, 8–21, 21–8 | Winner |