Stadium: MTA 08 Round: 62 Ground: Clay
| ITF M15 Antalya | 2021/04/11 07:00 | Matthew Dellavedova v Seong-Gook Oh | 7-5,5-7,10-8 |
| ITF M15 Antalya | 2021/04/05 07:00 | Emil Reinberg v Seong-Gook Oh | 6-2,6-2 |
| ITF M15 Antalya | 2021/04/04 06:30 | Stefanos Sakellaridis v Seong-Gook Oh | 2-6,4-6 |
| ITF M15 Antalya | 2021/03/29 07:00 | Manuel Mazza v Seong-Gook Oh | 6-4,6-1 |
| ITF M15 Antalya | 2021/03/28 06:30 | Artsiom Dabryian v Seong-Gook Oh | 1-6,3-6 |
| ITF M25 Nonthaburi | 2020/02/02 04:15 | Seong-Gook Oh v Maxence Broville | 6-7,1-6 |
| ITF M25 Nonthaburi | 2020/01/27 06:50 | Seong-Gook Oh v Nam Hoang Ly | 2-6,6-7 |
| ITF M25 Nonthaburi | 2020/01/26 11:00 | Seong-Gook Oh v Noppadol Noikor | 6-0,6-3 |
| ITF M15 St Petersburg | 2021/04/15 09:00 | Daniil Glinka v Marat Sharipov | 2-6,3-6 |
| ITF M15 St Petersburg | 2021/04/14 13:10 | Jan Satral v Daniil Glinka | 4-6,2-6 |
| ITF M15 St Petersburg | 2021/04/12 08:30 | Daniil Glinka v Alexander Zgirovsky | 7-6,7-6 |
| ITF M15 St Petersburg Qual | 2021/04/11 11:00 | Daniil Glinka v Alexander Stepin | 6-4,6-3 |
| ITF M15 St Petersburg | 2021/04/08 09:00 | Daniil Glinka v Jan Satral | 4-6,3-6 |
| ITF M15 St Petersburg | 2021/04/06 14:25 | Daniil Glinka v Daniil Golubev | 6-0,6-0 |
| ITF M15 St Petersburg | 2021/04/05 11:00 | Daniil Glinka v Yannik Steinegger | 6-2,6-2 |
| ITF M15 St Petersburg | 2021/04/04 10:05 | Daniil Glinka v Stepan Pecak | 7-5,6-1 |