Face à face
| Qatar Open XD | 2018/02/24 17:40 | Koki Niwa v Jeoung, Youngsik | W | 1-3 |
Home History
| German Open 2020, MS | 2019/10/10 15:30 | Yun-Ju Lin v Jeoung, Youngsik | W | 3-4 |
| German Open 2020, MS | 2019/10/09 11:00 | Steger, Bastian v Jeoung, Youngsik | W | 0-4 |
| German Open 2020, MS | 2019/10/08 16:45 | Kwan Kit Ho v Jeoung, Youngsik | W | 1-4 |
| Swedish Open (WTP) 2019, MS, Qualification | 2019/10/03 18:30 | Mizutani, Jun v Jeoung, Youngsik | L | 4-0 |
| Swedish Open (WTP) 2019, MS, Qualification | 2019/10/02 09:50 | Tomas Polansky v Jeoung, Youngsik | W | 1-4 |
| Swedish Open (WTP) 2019, MS, Qualification | 2019/10/01 13:20 | Jiaji Wu v Jeoung, Youngsik | W | 3-4 |
| Bulgaria Open 2019, MS | 2019/08/15 12:55 | Chien-An Chen v Jeoung, Youngsik | L | 4-2 |
| Australian Open 2019, MS | 2019/07/10 08:00 | Darko Jorgic v Jeoung, Youngsik | L | 4-1 |
Away History
| German Open 2020, MS | 2019/10/10 14:40 | Kenta Matsudaira v Koki Niwa | W | 1-4 |
| Swedish Open (WTP) 2019, MS, Qualification | 2019/10/04 16:00 | Koki Niwa v Simon Gauzy | L | 2-4 |
| Swedish Open (WTP) 2019, MS, Qualification | 2019/10/03 18:30 | Koki Niwa v Takuya Jin | W | 4-2 |
| Paraguay Open | 2019/09/12 18:00 | Koki Niwa v Kai Zhang | L | 2-4 |
| Japon - T League | 2019/09/06 11:02 | Chien-An Chen v Koki Niwa | W | 2-3 |
| Japon - T League | 2019/08/31 09:30 | Koki Niwa v Chien-An Chen | W | 3-0 |
| Czech Open | 2019/08/22 14:20 | Marcos Freitas v Koki Niwa | L | 4-1 |
| Bulgaria Open 2019, MS | 2019/08/15 13:45 | Marcos Freitas v Koki Niwa | L | 4-0 |