| 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 |
| ITF M15 Sharm El Sheikh | 2021/02/21 09:30 | Chien Hsun Lo v Jing L Weng | 6-1,7-5 |
| ITF M15 Troisdorf | 2021/05/12 09:00 | Constantin Schmitz v Tom Kocevar-Desman | 6-4,4-6,3-6 |
| ITF M15 Antalya | 2021/04/14 10:30 | Ivan Sergeyev v Constantin Schmitz | 6-3,5-7,6-3 |
| ITF M15 Antalya | 2021/04/08 06:55 | Flavio Cobolli v Constantin Schmitz | 7-6,7-6 |
| ITF M15 Antalya | 2021/04/06 07:00 | Constantin Schmitz v Bogdan Bobrov | 6-1,6-4 |
| ITF M15 Antalya | 2021/03/30 08:30 | Pol Martin Tiffon v Constantin Schmitz | 6-4,7-6 |
| ITF M15 Antalya | 2021/03/26 07:00 | Georgii Kravchenko v Constantin Schmitz | 6-2,6-3 |
| ITF M15 Antalya | 2021/03/24 07:30 | Constantin Schmitz v Pedro Vives Marcos | 6-3,6-3 |
| ITF M15 Monastir | 2021/03/10 10:30 | Yannick Mertens v Constantin Schmitz | 6-0,6-2 |