Stadium: Court 1 Round: 27 Ground: Hardcourt outdoor
| ITF M15 Saarlouis | 2023/06/19 13:00 | John Sperle v Adam Heinonen | 2-6,6-1,2-10 |
| ITF M15 Saarlouis | 2023/06/18 12:00 | John Sperle v Laurin Aerne | 6-4,6-2 |
| ITF M15 Duffel | 2023/06/16 11:00 | Ryan Nijboer v John Sperle | 6-4,4-6,6-3 |
| ITF M15 Duffel | 2023/06/15 08:00 | John Sperle v Simon Beaupain | 7-6,4-6,7-6 |
| ITF M15 Duffel | 2023/06/13 08:00 | John Sperle v Alessio Basile | 6-4,6-4 |
| ITF M15 Duffel | 2023/06/12 12:00 | John Sperle v Edouard Villoslada | 6-3,6-2 |
| ITF M15 Duffel | 2023/06/11 12:30 | John Sperle v Isac Stroemberg | 6-3,6-2 |
| Challenger Troisdorf | 2023/05/28 10:25 | Terence Atmane v John Sperle | 6-3,6-4 |
| 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 |
| ITF M15 Monastir | 2023/03/22 08:30 | Olaf Pieczkowski v Buvaysar Gadamauri | 2-6,6-3,2-6 |
| ITF M15 Monastir | 2023/03/19 08:30 | Olaf Pieczkowski v Lorenzo Rottoli | 6-7,3-6 |
| ITF M15 Monastir | 2023/03/18 10:15 | Simone Roncalli v Olaf Pieczkowski | 2-6,2-6 |