Estádio: Court 5 Round: 25 Ground: Clay
| ITF - M15 Allershausen | 2021/09/01 12:05 | Milan Welte v Niklas Schell | 6-3,2-6,3-6 |
| ITF - M25 Trier | 2021/08/24 11:00 | Milan Welte v Tim Handel | 6-2,1-6,6-7 |
| ITF - M25 Üeberlingen | 2021/08/19 10:35 | Louis Wessels v Milan Welte | 6-4,6-3 |
| ITF - M25 Üeberlingen | 2021/08/18 14:10 | Milan Welte v Constantin Bittoun Kouzmine | 6-4,6-0 |
| ITF - M25 Frankfurt am Main | 2021/08/09 14:10 | Milan Welte v Taiyo Yamanaka | 6-7,4-6 |
| ITF - M15 Parnu | 2021/08/04 09:20 | Vladimir Ivanov v Milan Welte | 7-5,1-6,6-3 |
| ITF - M25 Marburgo | 2021/07/09 12:00 | Ryan Nijboer v Milan Welte | 4-6,6-3,6-1 |
| ITF - M25 Marburgo | 2021/07/08 08:55 | Milan Welte v Neo Niedner | 6-2,6-1 |
| Challenger - Szczecin | 2021/09/17 13:00 | Pawel Juszczak v Yannick Hanfmann | 2-6,5-7 |
| Challenger - Szczecin | 2021/09/15 13:30 | Stefano Travaglia v Pawel Juszczak | 6-7,6-3,2-6 |
| Challenger - Szczecin | 2021/09/13 15:00 | Pawel Juszczak v Vit Kopriva | 6-2,4-6,6-4 |
| ITF - M25 Poznan | 2021/08/29 09:00 | Pawel Juszczak v Roman Andres Burruchaga | 7-5,3-6,2-6 |
| ITF - M25 Poznan | 2021/08/28 11:00 | Shintaro Mochizuki v Pawel Juszczak | 7-5,5-7,1-6 |
| ITF - M25 Poznan | 2021/08/27 11:30 | Pawel Juszczak v Igor Marcondes | 6-2,5-7,6-4 |
| ITF - M25 Poznan | 2021/08/26 08:55 | Pawel Juszczak v Aleksander Orlikowski | 6-1,6-0 |
| ITF - M25 Poznan | 2021/08/25 08:00 | Filip Peliwo v Pawel Juszczak | 5-7,0-6 |