Stadium: Court Central Round: 19 Ground: Hardcourt indoor
| ITF - Gdynia M15 | 2021/08/10 08:00 | Alexander Kotzen v Olaf Pieczkowski | 2-6,6-2,8-10 |
| Challenger Drummondville | 2023/11/12 16:25 | Olaf Pieczkowski v Marko Stakusic | 7-6,5-7,6-2 |
| ITF - Monastir M15 | 2023/11/05 08:30 | Elliot Benchetrit v Olaf Pieczkowski | 6-2,6-3 |
| ITF - Monastir M15 | 2023/11/03 08:30 | John Sperle v Olaf Pieczkowski | 3-6,2-6 |
| ITF - Monastir M15 | 2023/11/02 10:55 | Fabio De Michele v Olaf Pieczkowski | 4-6,4-6 |
| ITF - Monastir M15 | 2023/11/01 08:00 | Diego F Flores v Olaf Pieczkowski | 4-6,6-2,2-6 |
| ITF - Monastir M15 | 2023/10/29 08:30 | Olaf Pieczkowski v Alberto Barroso Campos | 1-6,1-6 |
| ITF - Monastir M15 | 2023/10/28 08:30 | Guido Ivan Justo v Olaf Pieczkowski | 6-1,6-7,3-6 |
| ITF - Monastir M15 | 2023/10/27 08:30 | Adrien Gobat v Olaf Pieczkowski | 4-6,5-7 |
| Challenger Drummondville | 2023/11/12 16:35 | Roko Horvat v Alexander Kotzen | 3-6,1-6 |
| Challenger Knoxville | 2023/11/05 22:00 | Alexander Kotzen v Gabi Adrian Boitan | 7-6,4-6,3-6 |
| ITF - Edmonton M25 | 2023/11/01 18:20 | Andres Martin v Alexander Kotzen | 6-0,6-3 |
| ITF - Saint-Augustin M25 | 2023/10/26 16:30 | Mohamed Aziz Dougaz v Alexander Kotzen | 6-3,7-6 |
| ITF - Saint-Augustin M25 | 2023/10/24 17:10 | Alexander Kotzen v Enzo Wallart | 6-3,6-4 |
| ITF - Southaven M25 | 2023/08/10 22:45 | Alexander Kotzen v Martin Damm | 3-6,6-3,3-6 |
| ITF - Southaven M25 | 2023/08/09 21:35 | Ishaan Ravichander v Alexander Kotzen | 6-7,1-6 |
| ITF - Decatur M25 | 2023/08/03 19:20 | Alexander Kotzen v Jonah Braswell | 2-6,6-0,6-7 |