Stadium: Sparkassen Court Round: 26 Ground: Clay
| ITF M25 Marburg | 2021/07/07 13:00 | Louis Wessels v Niklas Schell | 6-3,6-4 |
| ITF M25 Alkmaar | 2021/06/23 12:10 | Louis Wessels v Carlos Lopez Montagud | 3-6,6-4,4-6 |
| ITF - M15 Bucarest | 2021/05/25 15:00 | Facundo Juarez v Louis Wessels | 6-2,6-0 |
| ITF M15 Troisdorf | 2021/05/14 16:10 | Louis Wessels v Sebastian Fanselow | 4-6,5-7 |
| ITF M15 Troisdorf | 2021/05/13 11:45 | Louis Wessels v Marlon Vankan | 4-6,6-2,7-6 |
| ITF M15 Troisdorf | 2021/05/12 11:40 | Louis Wessels v Smits, Glenn | 6-1,6-3 |
| Sibenik, Singles M-ITF-CRO-05A | 2021/04/21 08:00 | Louis Wessels v Simon Beaupain | 7-5,1-6,5-7 |
| ITF M25 Meerbusch | 2021/04/14 10:00 | Louis Wessels v Niels Visker | 2-6,2-6 |
| ITF M25 Marburg | 2021/07/06 16:40 | Alexander Donski v Jahn, Jeremy | 6-2,6-2 |
| ITF - M15 Monastir | 2021/06/23 08:30 | Alexander Donski v Omni Kumar | 1-6,3-6 |
| ITF - M15 Monastir | 2021/06/17 11:40 | Alexander Donski v Luca Giacomini | 3-6,3-6 |
| ITF - M15 Monastir | 2021/06/15 08:30 | Lucio Carnevalle v Alexander Donski | 2-6,3-6 |
| ITF - M15 Héraklion | 2021/06/10 07:30 | Alexander Donski v Yuki Mochizuki | 3-6,4-6 |
| ITF - M15 Héraklion | 2021/06/09 11:50 | Alexander Donski v Daniel Little | 1-6,6-3,6-1 |
| ITF - M15 Héraklion | 2021/06/03 06:30 | Alexander Donski v Stalder, Reese | 3-6,6-3,4-6 |
| ITF - M15 Héraklion | 2021/06/01 08:00 | Alexander Donski v Kelsey Stevenson | 6-3,6-2 |