Stadium: MTA 16 Round: 26 Ground: Clay
| Challenger Columbus | 2021/09/22 14:00 | Ji Sung Nam v Alex Bolt | 6-7,4-6 |
| Challenger Columbus | 2021/09/21 14:00 | Yunseong Chung v Ji Sung Nam | 6-3,4-6,6-7 |
| Davis Cup | 2021/09/17 16:00 | Rubin Statham v Ji Sung Nam | 2-6,2-6 |
| ITF M15 Monastir | 2021/06/30 08:30 | Ji Sung Nam v Moez Echargui | 3-6,4-6 |
| ITF M15 Monastir | 2021/06/22 10:50 | Ji Sung Nam v Rinky Hijikata | 3-6,1-6 |
| ITF M15 Monastir | 2021/06/16 08:30 | Ji Sung Nam v Aidan Mayo | 6-4,3-6,2-6 |
| ITF M15 Monastir | 2021/06/11 08:30 | Ji Sung Nam v Jeremy Beale | 1-6,6-1,6-7 |
| ITF M15 Monastir | 2021/06/10 08:25 | Ji Sung Nam v Erik Crepaldi | 6-4,7-5 |
| ITF M15 Platja D'Aro | 2021/10/05 08:30 | Maciej Rajski v Lorenzo Joaquin Rodriguez | 3-6,6-3,9-11 |
| ITF M15 Platja D'Aro | 2021/10/04 11:00 | Maciej Rajski v Edas Butvilas | 6-2,3-6,12-10 |
| ITF M15 Platja D'Aro | 2021/10/03 09:30 | Maciej Rajski v Alberto Nieto | 6-1,6-2 |
| ITF M25 Pardubice | 2021/09/23 12:45 | Maciej Rajski v Tim Handel | 5-7,6-4,7-5 |
| ITF M25 Pardubice | 2021/09/22 10:20 | Martin Krumich v Maciej Rajski | 7-6,3-6,6-7 |
| Challenger Szczecin | 2021/09/13 09:00 | Alexey Vatutin v Maciej Rajski | 5-7,6-3,6-4 |
| Challenger Szczecin | 2021/09/12 10:30 | Maciej Rajski v Rudolf Molleker | 7-5,6-4 |
| ITF M15 Lodz | 2021/08/22 08:30 | Maciej Rajski v Yann Wojcik | 6-3,6-7,6-1 |