Stadium: Court 7 Round: 62 Ground: Clay
| ITF M15 Skopje | 2021/05/31 08:00 | Niels Visker v Lazar Milicevic | 6-7,6-3,12-10 |
| ITF M15 Valldoreix | 2021/05/13 10:10 | Rayane Roumane v Niels Visker | 6-4,2-6,6-4 |
| ITF M15 Valldoreix | 2021/05/12 08:00 | Georgii Kravchenko v Niels Visker | 6-7,1-6 |
| ITF M15 Valldoreix | 2021/05/11 08:00 | Niels Visker v Francisco Cabral | 7-5,6-0 |
| ITF M15 Valldoreix | 2021/05/10 09:00 | Pierre Delage v Niels Visker | 4-6,2-6 |
| ITF M15 Valldoreix | 2021/05/09 12:00 | Niels Visker v Alejandro Moro Canas | 3-6,6-2,10-6 |
| ITF M15 Majadahonda | 2021/05/06 08:30 | Georgii Kravchenko v Niels Visker | 2-6,6-3,6-2 |
| ITF M15 Majadahonda | 2021/05/05 07:00 | Dominic Stephan Stricker v Niels Visker | 6-3,3-6,3-6 |
| ITF M15 Skopje | 2021/05/31 08:00 | Tom Gentzsch v Louis Allen | 7-6,2-6,13-11 |
| ITF M15 Skopje | 2021/05/30 07:00 | Aloys J W Van Baal v Tom Gentzsch | 1-6,7-5,7-10 |
| ITF M15 Heraklion | 2021/05/17 07:00 | Milan Welte v Tom Gentzsch | 6-0,6-3 |
| ITF M15 Heraklion | 2021/05/16 06:30 | Cheraag Bajwa v Tom Gentzsch | 2-6,1-6 |
| ITF M25 Meerbusch | 2021/04/12 12:00 | Alexey Vatutin v Tom Gentzsch | 6-3,6-1 |
| ITF M25 Meerbusch | 2021/04/12 07:30 | Tom Gentzsch v Fred Olivier Schommer | 7-6,6-2 |