Stadium: Court 4 Round: 25 Ground: Clay
| ITF M15 Alkmaar | 2023/06/29 14:55 | Dax Donders v Brian Bozemoj | 6-0,4-6,0-6 |
| ITF M15 Alkmaar | 2023/06/28 17:30 | Andres Andrade v Dax Donders | 4-6,4-6 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/20 10:00 | Dax Donders v Liam Gavrielides | 2-6,1-6 |
| ITF - M15 Antalya | 2023/05/07 07:00 | Dax Donders v Mikhail Gorokhov | 6-7,6-7 |
| ITF - M15 Antalya | 2023/05/03 07:30 | Peter Benjamin Privara v Dax Donders | 6-3,6-4 |
| ITF - M15 Antalya | 2023/05/02 07:30 | Dax Donders v Gino Romano | 7-5,7-6 |
| ITF - M15 Antalya | 2023/05/01 09:05 | Dax Donders v Gabriel Elicha Navas | 7-5,6-0 |
| ITF - M15 Antalya | 2023/04/30 07:00 | Dax Donders v Zayed, Mousa Shanan | 6-0,6-0 |
| ITF M15 Wroclaw | 2023/06/29 08:00 | Kirill Kivattsev v Olaf Pieczkowski | 4-6,6-0,6-1 |
| ITF M15 Wroclaw | 2023/06/28 13:05 | Olaf Pieczkowski v Filip Duda | 6-2,6-2 |
| ITF M25 Poprad | 2023/06/21 09:50 | Olaf Pieczkowski v Kodat, Toby Alex | 0-6,1-6 |
| ITF M15 Litija | 2023/06/15 12:45 | Luca Wiedenmann v Olaf Pieczkowski | 6-3,6-0 |
| ITF M15 Litija | 2023/06/14 12:10 | Nikola Basic v Olaf Pieczkowski | 0-6,2-6 |
| ITF - M15 Constanta | 2023/06/01 08:00 | Radu Mihai Papoe v Olaf Pieczkowski | 6-1,6-4 |
| ITF - M15 Constanta | 2023/05/30 10:35 | Joao Victor C Loureiro v Olaf Pieczkowski | 4-6,6-1,4-6 |
| ITF M15 Pazardzhik | 2023/05/24 14:00 | Leonardo Rossi v Olaf Pieczkowski | 7-6,7-6 |