Stadium: Center Court Round: 14 Ground: Hardcourt outdoor
| ITF M25 Lodz | 2023/08/09 17:15 | Szymon Kielan v Patrick Kaukovalta | 6-7,4-6 |
| ITF M15 Novi Sad | 2023/08/02 13:50 | Szymon Kielan v Stefan Popovic | 2-6,1-6 |
| ITF M15 Sofia | 2023/07/06 06:30 | Szymon Kielan v Andreja Petrovic | 6-3,6-3 |
| ITF M15 Sofia | 2023/07/04 07:00 | Federico Agustin Gomez v Szymon Kielan | 2-6,3-6 |
| ITF M15 Wroclaw | 2023/06/27 08:00 | Tyler Zink v Szymon Kielan | 6-3,6-1 |
| ITF M15 Monastir | 2023/04/19 11:10 | Shunsuke Nakagawa v Szymon Kielan | 6-4,6-1 |
| ITF M15 Monastir | 2023/04/13 08:30 | Szymon Kielan v Daniel Rodrigues | 2-6,2-6 |
| ITF M15 Monastir | 2023/04/12 08:30 | Szymon Kielan v David Perez Sanz | 7-6,6-3 |
| ITF M15 Raanana | 2023/08/04 10:25 | Amit Vales v Alex Knaff | 6-4,6-2 |
| ITF M15 Raanana | 2023/08/03 07:25 | Lior Goldenberg v Alex Knaff | 3-6,3-6 |
| ITF M15 Raanana | 2023/08/02 07:30 | Ron Ellouck v Alex Knaff | 1-6,2-6 |
| ITF M15 Raanana | 2023/08/01 07:00 | Luca Fantini v Alex Knaff | 3-6,6-7 |
| ITF M25 Esch/Alzette | 2023/07/23 13:00 | Alex Knaff v Marlon Vankan | 6-3,6-1 |
| ITF M25 Esch/Alzette | 2023/07/22 14:25 | Alex Knaff v Mikalai Haliak | 7-6,6-4 |
| ITF M25 Esch/Alzette | 2023/07/21 10:00 | Stefanos Sakellaridis v Alex Knaff | 1-6,1-6 |
| ITF M25 Esch/Alzette | 2023/07/20 10:35 | Arthur Nagel v Alex Knaff | 4-6,2-6 |