Stadium: Court 1 Round: 54 Ground: Clay
| Prostejov, Singles M-ITF-CZE-04A | 2021/08/15 09:00 | Galfinger, Rostislav v Simon Malis | 6-1,4-6,8-10 |
| Prostejov, Singles M-ITF-CZE-04A | 2021/08/15 08:00 | Krcma, Tomas v Tom Gentzsch | 0-6,2-6 |
| Challenger Meerbusch | 2021/08/08 08:00 | Jesper De Jong v Tom Gentzsch | 6-1,6-3 |
| ITF M15 Skopje | 2021/06/01 08:00 | Niels Visker v Tom Gentzsch | 6-4,6-1 |
| 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 | van Baal, Aloys Johannes Willem v Tom Gentzsch | 1-6,7-5,7-10 |
| ITF - M15 Héraklion | 2021/05/17 07:00 | Milan Welte v Tom Gentzsch | 6-0,6-3 |
| ITF - M15 Héraklion | 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 |