Stadium: Court 4 Round: 62 Ground: Hardcourt outdoor
| German Championship | 2021/12/08 09:00 | Tom Gentzsch v Luca Gelhardt | 4-6,1-6 |
| ITF M15 Heraklion | 2021/11/14 11:00 | Leon Hoeveler v Tom Gentzsch | 6-4,6-3 |
| ITF M25 Villers Les Nancy | 2021/11/07 09:00 | Matt Ponchet v Tom Gentzsch | 6-1,6-4 |
| ITF M15 Parnu | 2021/10/28 08:55 | Tom Gentzsch v Vladimir Ivanov | 7-5,2-6,4-6 |
| ITF M15 Parnu | 2021/10/27 13:55 | Tom Gentzsch v Robertas Vrzesinski | 6-1,6-2 |
| ITF M15 Parnu | 2021/10/26 08:00 | Tom Gentzsch v Oskar Antinheimo | 6-2,6-4 |
| ITF M25 Hamburg | 2021/10/19 09:25 | Daniel Little v Tom Gentzsch | 6-4,6-2 |
| UTR Pro Tennis Series Mulheim | 2021/10/16 08:00 | Benjamin Hassan v Tom Gentzsch | 6-4,6-7,0-0 |
| ITF M15 Nules | 2021/11/14 08:30 | Ilya Rudiukov v Mikel Aranzabal | 7-6,7-5 |
| ITF M15 Benicarlo | 2021/11/09 08:30 | Lorenzo Rottoli v Mikel Aranzabal | 6-1,6-0 |
| ITF M15 Benicarlo | 2021/11/08 10:00 | Mikel Aranzabal v Mario Mansilla Diez | 6-3,3-6,11-9 |
| ITF M15 Benicarlo | 2021/11/07 08:30 | Mikel Aranzabal v Peetu Pohjola | 7-6,3-6,10-8 |
| ITF M25 Madrid | 2021/10/25 10:30 | Ilya Rudiukov v Mikel Aranzabal | 6-0,1-6,10-6 |
| ITF M15 Xativa | 2021/08/02 07:00 | Alejandro Garcia v Mikel Aranzabal | 6-3,6-2 |
| ITF M25 Denia | 2021/07/25 14:30 | Pawel Juszczak v Mikel Aranzabal | 6-0,6-0 |
| ITF M25 Reus | 2021/04/11 07:00 | Imanol L Morillo v Mikel Aranzabal | 6-1,6-1 |