Stadium: Sparkassen Court Round: 26 Ground: Clay
| ITF M25 Marburg | 2021/07/07 12:30 | Daniel Cukierman v Milan Welte | 4-6,4-6 |
| ITF M25 Marburg | 2021/07/06 15:00 | Milan Welte v Raphael Collignon | 7-6,6-3 |
| ITF M25 Marburg | 2021/07/05 13:05 | Milan Welte v Christopher Patzanovsky | 6-1,6-3 |
| ITF M15 Heraklion | 2021/05/17 07:00 | Milan Welte v Tom Gentzsch | 6-0,6-3 |
| ITF M15 Troisdorf | 2021/05/09 13:00 | Yannik Steinegger v Milan Welte | 6-4,6-2 |
| ITF M25 Meerbusch | 2021/04/16 09:00 | Milan Welte v Alexander Erler | 1-6,4-6 |
| ITF M25 Meerbusch | 2021/04/15 10:00 | Markus Eriksson v Milan Welte | 3-6,1-6 |
| ITF M25 Meerbusch | 2021/04/14 12:15 | Milan Welte v Pietro Rondoni | 6-3,4-6,6-4 |
| German Championship | 2020/12/07 15:00 | Neo Niedner v Jim Walder | 2-6,6-4,6-7 |