Stadium: Calvo s Ct Round: 26 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/06/27 08:00 | Omar Brigida v Geun Jun Kim | 6-3,6-1 |
| ITF M15 Monastir | 2021/06/21 09:00 | Alexander Kotzen v Geun Jun Kim | 6-0,6-2 |
| ITF M15 Monastir | 2021/06/20 10:30 | Geun Jun Kim v Ali Alshati | 6-2,6-0 |
| ITF M15 Monastir | 2021/06/13 12:30 | Omni Kumar v Geun Jun Kim | 6-1,6-0 |
| ITF M15 Monastir | 2021/06/06 10:00 | Ji Hoon Son v Geun Jun Kim | 6-2,7-5 |
| ITF M15 Changwon | 2019/10/16 00:45 | Geun Jun Kim v Sora Fukuda | 4-6,3-6 |
| ITF M15 Hua Hin | 2019/08/27 04:00 | Ti Chen v Geun Jun Kim | 4-6,7-5,10-2 |
| ITF M15 Anseong | 2019/06/26 01:00 | Yeongseok Jeong v Geun Jun Kim | 6-3,6-1 |
| ITF M25 Pretoria | 2021/09/29 13:05 | Takuto Niki v Dylan Salton | 2-6,6-7 |
| ITF M25 Johannesburg | 2021/09/21 10:15 | Takuto Niki v Mateus Alves | 3-6,4-6 |
| ITF M25 Johannesburg | 2021/09/15 08:00 | Takuto Niki v Jeremy Beale | 0-6,4-6 |
| ITF M15 Monastir | 2021/09/09 08:00 | Takuto Niki v Masamichi Imamura | 2-6,3-6 |
| ITF M15 Monastir | 2021/09/08 08:00 | Takuto Niki v Lucca Pinto | 6-2,6-2 |
| ITF M15 Monastir | 2021/09/01 09:30 | Takuto Niki v Guy Orly Iradukunda | 6-2,2-6,3-6 |
| ITF M15 Castelo Branco | 2021/07/28 17:20 | Takuto Niki v Luca Giacomini | 4-6,5-7 |
| ITF M25 Idanha-A-Nova | 2021/07/21 12:05 | Takuto Niki v Nicolas Moreno De Alboran | 3-6,2-6 |