Stadium: Hard Court 3 Round: 62 Ground: Hardcourt outdoor
| ITF M15 Monastir | 2021/06/20 12:00 | Timur Kiyamov v Dong Ju Kim | 7-6,6-3 |
| ITF M15 Monastir | 2021/06/14 08:00 | Ajeet Rai v Dong Ju Kim | 5-7,6-4,12-10 |
| ITF M15 Monastir | 2021/06/13 11:30 | Lucas Cotler v Dong Ju Kim | 2-6,2-6 |
| ITF M15 Monastir | 2021/06/09 08:25 | Dong Ju Kim v Uisung Park | 2-6,1-6 |
| ITF M15 Monastir | 2021/06/07 13:30 | Dong Ju Kim v Sungbeen Sim | 6-0,3-6,10-7 |
| ITF M15 Monastir | 2021/06/07 09:00 | Kazuki Nishiwaki v Dong Ju Kim | 2-6,3-6 |
| ITF M15 Monastir | 2021/05/30 09:30 | Dong Ju Kim v Ren Nakamura | 7-5,6-7,5-10 |
| ITF M15 Monastir | 2021/05/24 12:30 | Uisung Park v Dong Ju Kim | 6-4,6-1 |
| ITF M25 Marburg | 2021/07/05 12:25 | Jing L Weng v Raphael Collignon | 2-6,6-3,8-10 |
| ITF M25 The Hague | 2021/06/27 08:00 | Guy Den Heijer v Jing L Weng | 6-3,6-4 |
| ITF M15 Antalya | 2021/05/09 07:00 | Jing L Weng v Mark Tryakshin | 2-6,5-7 |
| ITF M15 Antalya | 2021/05/02 06:00 | Vladislav Melnic v Jing L Weng | 6-4,6-0 |
| ITF M25 Meerbusch | 2021/04/12 09:30 | David Pichler v Jing L Weng | 6-2,6-1 |
| ITF M25 Meerbusch | 2021/04/11 12:45 | Jing L Weng v Amer Naow | 6-4,7-5 |
| ITF M15 Sharm El Sheikh | 2021/03/10 11:20 | Jing L Weng v Lukas Krainer | 2-6,1-6 |
| ITF M15 Sharm El Sheikh | 2021/02/28 11:00 | Jing L Weng v Lukas Krainer | 0-6,3-6 |