Stadium: Court 8 Round: 25 Ground: Clay
| 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 M25 Trnava | 2023/03/28 13:25 | Szymon Kielan v Hynek Barton | 6-4,2-6,4-6 |
| ITF M15 Monastir | 2023/03/17 11:00 | Olaf Pieczkowski v Szymon Kielan | 6-1,6-1 |
| ITF M15 Metzingen | 2023/07/28 13:50 | Stefan Popovic v Nicola Kuhn | 4-6,4-6 |
| ITF M15 Metzingen | 2023/07/27 11:00 | Stefan Popovic v Yannik Kelm | 6-4,4-6,6-2 |
| ITF M15 Metzingen | 2023/07/26 12:30 | Stefan Popovic v Alexander Donski | 2-6,6-3,7-5 |
| ITF M15 Uslar | 2023/07/23 12:00 | Sebastian Prechtel v Stefan Popovic | 6-3,4-6,6-3 |
| ITF M15 Uslar | 2023/07/22 11:30 | Nicolas Zanellato v Stefan Popovic | 3-6,2-6 |
| ITF M15 Uslar | 2023/07/20 11:00 | Stefan Popovic v Adrian Oetzbach | 7-6,6-4 |
| ITF M15 Uslar | 2023/07/18 15:55 | Stefan Popovic v Max Wiskandt | 7-5,6-3 |
| ITF M25 Marburg | 2023/07/07 09:00 | Timo Stodder v Stefan Popovic | 6-1,6-3 |