| Roles | Competed in Youth Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Jeong•Yun-Seong | |
| Used name | Jeong•Yun-Seong | |
| Name order | Oriental | |
| Original name | 정•윤성 | |
| Other names | Chung Yun-Seong | |
| Born | 27 March 1998 | |
| NOC | Republic of Korea |  KOR |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 2014 Summer Youth Olympics | Tennis | KOR |
Jeong Yun-Seong | |||
| Singles, Boys (YOG) | =9 | |||||
| Doubles, Mixed Youth (YOG) | Kamonwan Buayam | =17 | ||||
| Doubles, Boys (YOG) | Lee Deok-Hui | =5 |
