Stadium: Court 7 Round: 62 Ground: Hardcourt outdoor
| ITF M25 Hamburg | 2021/10/17 08:00 | Yannick Wunderlich v Ben Jones | 0-6,2-6 |
| ITF M25 Ueberlingen | 2021/08/16 09:20 | Oscar Galimardanov v Yannick Wunderlich | 7-5,6-4 |
| ITF M25 Frankfurt am Main | 2021/08/09 09:00 | Sandro Kopp v Yannick Wunderlich | 6-3,6-4 |
| ITF M25 Wetzlar | 2021/08/02 08:00 | Yannick Wunderlich v Giles Hussey | 6-7,5-7 |
| ITF M15 Monastir | 2021/06/07 08:00 | Ko Suzuki v Yannick Wunderlich | 6-7,7-6,10-8 |
| ITF M15 Monastir | 2021/06/06 08:00 | Leonardo L Linquet v Yannick Wunderlich | 3-6,5-7 |
| ITF M15 Monastir | 2021/05/31 08:00 | Mauro De Maio v Yannick Wunderlich | 6-0,7-6 |
| ITF M15 Monastir | 2021/05/30 10:30 | Yannick Wunderlich v Skander Ben Abdallah | 6-0,6-1 |
| ITF M15 Monastir | 2021/10/18 15:15 | Sabit Suntic v Christian Kuehne | 5-7,6-4,10-4 |
| ITF M15 Monastir | 2021/10/18 10:30 | Fabian Hansch Mauritzson v Christian Kuehne | 1-6,3-6 |
| ITF M25 Sierre | 2021/08/31 10:40 | Christian Kuehne v Jacopo Berrettini | 3-6,0-6 |
| ITF M25 Sierre | 2021/08/29 11:40 | Christian Kuehne v Leo Galliano | 6-3,6-0 |
| ITF M25 Caslano | 2021/08/24 11:55 | Christian Kuehne v Gabriele Moghini | 1-6,2-6 |
| ITF M25 Caslano | 2021/08/23 16:05 | Lilian Breut v Christian Kuehne | 0-6,6-1,6-10 |
| ITF M25 Muttenz | 2021/08/16 08:00 | Louroi Martinez v Christian Kuehne | 6-3,6-4 |
| ITF M15 Monastir | 2021/08/01 10:00 | Siddhant Banthia v Christian Kuehne | 6-4,7-5 |