Stadium: Center Court Round: 54 Ground: Hardcourt outdoor
| ITF M25 Monastir | 2023/11/20 08:00 | Romeo Hadzimehmedovic v Oskar Grzegorzewski | 5-7,6-3,10-7 |
| ITF M25 Monastir | 2023/11/19 08:30 | Victor Kuznetsov v Oskar Grzegorzewski | 6-7,3-6 |
| ITF - M15 Monastir | 2023/11/15 08:30 | Oskar Grzegorzewski v Juan Bautista Otegui | 4-6,2-6 |
| ITF - M15 Monastir | 2023/11/13 10:30 | Oskar Grzegorzewski v Saba George Nanobashvili | 3-6,6-2,10-1 |
| ITF - M15 Héraklion | 2023/10/22 08:30 | Oskar Grzegorzewski v Gianluca Carlini | 4-6,4-6 |
| ITF - M15 Doha | 2023/10/10 14:00 | Pablo Trochu v Oskar Grzegorzewski | 6-3,6-4 |
| ITF - M15 Doha | 2023/10/09 11:55 | Oskar Grzegorzewski v Andrei Cuceu | 6-2,7-6 |
| Koszalin, Singles Qualifying M-ITF-POL-02A | 2023/09/07 16:00 | Oskar Grzegorzewski v Tom Gentzsch | 3-6,5-7 |
| ITF - M15 Monastir | 2023/11/19 09:30 | Adam Majchrzak v Umberto Maria Giovannini | 4-6,0-6 |
| ITF - M15 Monastir | 2023/11/12 10:00 | Enzo Lima v Adam Majchrzak | 6-3,3-6,10-7 |
| Koszalin, Singles Qualifying M-ITF-POL-02A | 2023/09/04 09:00 | Adam Majchrzak v Przemyslaw Michocki | 5-7,3-6 |
| Koszalin, Singles Qualifying M-ITF-POL-02A | 2023/09/03 09:00 | Adam Majchrzak v Andrzejczuk, Adrian | 6-4,1-6,10-6 |
| ITF M15 Szczawno | 2023/08/30 08:35 | Adam Majchrzak v Marcel Zielinski | 2-6,3-6 |
| ITF M25 Lodz | 2023/08/09 09:20 | Alex M Pujolras v Adam Majchrzak | 6-1,6-7,6-2 |
| ITF M15 Wroclaw | 2023/06/28 08:00 | Adam Majchrzak v Mikula, Michal | 2-6,3-6 |
| ITF M15 Lodz | 2022/07/27 09:30 | Maks Kasnikowski v Adam Majchrzak | 6-4,6-0 |