Stadium: Court 3 Round: 54 Ground: Hardcourt indoor
| 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 |
| ITF M15 Kouvola | 2021/05/25 08:30 | Karl Kiur Saar v Oskar Antinheimo | 6-3,6-0 |
| ITF M15 Pajulahti | 2019/09/18 12:20 | Naoki Tajima v Oskar Antinheimo | 6-2,6-1 |
| ITF M15 Helsinki | 2019/08/21 10:55 | Oskar Antinheimo v Patrik Niklas-Salminen | 2-6,2-6 |