Stadium: Court 1 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Vaasa | 2023/06/05 12:30 | Noel Larwig v Johannes Seeman | 4-6,4-6 |
| Davis Cup | 2023/02/05 20:45 | Jacob Bicknell v Johannes Seeman | 1-6,0-6 |
| ITF M15 Helsinki | 2022/08/09 08:30 | Johannes Seeman v Vesa Ahti | 6-0,4-6,3-10 |
| ITF M15 Parnu | 2022/08/03 10:55 | Szymon Kielan v Johannes Seeman | 6-1,3-6,6-1 |
| ITF M15 Vaasa | 2022/06/01 12:55 | Johannes Seeman v Matvey Minin | 6-4,4-6,5-7 |
| ITF M15 Vaasa | 2022/05/30 11:30 | Ivan Denisov v Johannes Seeman | 1-6,6-7 |
| ITF M15 Kouvola | 2022/05/18 13:05 | Johannes Seeman v Leevi Saatela | 3-6,7-6,3-6 |
| ITF M15 Kouvola | 2022/05/17 08:00 | Julien De Cuyper v Johannes Seeman | 3-6,1-6 |
| ITF M15 Vaasa | 2023/06/05 12:30 | Oskar Antinheimo v Jeiden Saidizand | 4-6,6-1,10-5 |
| ITF M15 Winston-Salem | 2022/11/08 17:30 | Luca Staeheli v Oskar Antinheimo | 7-5,6-2 |
| ITF M15 Winston-Salem | 2022/11/07 18:00 | Oskar Antinheimo v Victor Putter | 7-5,6-3 |
| UTR Pro Tennis Series Winston-Salem | 2022/09/08 22:43 | Juan Lopez De Azcona Vale v Oskar Antinheimo | 6-0,6-2 |
| ITF M15 Vaasa | 2022/06/01 14:55 | Oskar Antinheimo v Luca Castelnuovo | 1-6,2-6 |
| ITF M15 Vaasa | 2022/05/31 08:30 | Oskar Antinheimo v Luca Teboul | 6-1,6-1 |
| ITF M15 Vaasa | 2022/05/30 10:00 | Oskar Antinheimo v Otto Leikola | 6-2,6-2 |
| ITF M15 Kouvola | 2022/05/18 09:40 | Karl Friberg v Oskar Antinheimo | 6-4,6-1 |