Stadium: Court 3 Round: 54 Ground: Hardcourt indoor
| 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 |
| UTR Pro Tennis Series Mulheim | 2021/10/15 07:00 | Tom Gentzsch v Christian Hansen | 4-6,1-6 |
| UTR Pro Tennis Series Mulheim | 2021/10/14 08:30 | Tom Gentzsch v Alen Moritz Hodzic | 4-6,6-2,5-4 |
| UTR Pro Tennis Series Mulheim | 2021/10/13 11:30 | Quin Verstegen v Tom Gentzsch | 4-6,2-6 |
| UTR Pro Tennis Series Mulheim | 2021/10/12 11:30 | Filip Duda v Tom Gentzsch | 6-4,5-2 |
| ITF M25 Eupen | 2021/09/07 10:05 | Guy Den Heijer v Tom Gentzsch | 6-3,6-4 |
| ITF M25 Eupen | 2021/09/06 13:30 | Nico Hornitschek v Tom Gentzsch | 4-6,4-6 |
| ITF M25 Falun | 2021/09/26 08:00 | Lucas Renard v Oskar Antinheimo | 7-5,5-7,10-6 |
| ITF M15 Parnu | 2021/08/02 09:30 | Oskar Antinheimo v Petro Orlando Fellin | 5-7,3-6 |
| ITF M15 Helsinki | 2021/06/01 07:00 | Oskar Antinheimo v Roni Mikael Hietaranta | 2-6,1-6 |
| ITF M15 Helsinki | 2021/05/31 08:30 | Pierre Delage v Oskar Antinheimo | 6-7,7-5,8-10 |
| 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 |