Stadium: Court 2 Round: 25 Ground: Clay
| ITF M25 Trnava | 2024/03/27 11:55 | Szymon Kielan v Mirza Basic | 5-7,4-6 |
| ITF M25 Trnava | 2024/03/26 10:35 | Szymon Kielan v Tomas Talajka | 7-5,6-0 |
| ITF M25 Trnava | 2024/03/25 09:00 | Szymon Kielan v Lukas Janousek | 6-4,6-2 |
| ITF M15 Sharm El Sheikh | 2024/03/13 08:00 | Amr Asrawy v Szymon Kielan | 6-3,7-5 |
| ITF M15 Sharm El Sheikh | 2024/03/06 08:00 | Szymon Kielan v David Perez Sanz | 3-6,3-6 |
| ITF M15 Sharm El Sheikh | 2024/03/01 08:00 | Szymon Kielan v Adrian Oetzbach | 3-6,4-6 |
| ITF M15 Sharm El Sheikh | 2024/02/29 10:10 | Szymon Kielan v Aleksa Pisaric | 6-2,6-3 |
| ITF M15 Sharm El Sheikh | 2024/02/28 13:20 | Antoine Ghibaudo v Szymon Kielan | 6-4,6-7,1-6 |
| ITF M15 Boca Raton | 2023/11/16 13:00 | John H Lithen v Arvid Nordquist | 2-6,5-7 |
| ITF M15 Fayetteville | 2023/11/01 20:50 | Joshua Sheehy v John H Lithen | 6-2,3-6,7-6 |
| ITF M15 Fayetteville | 2023/10/31 15:00 | Keshav Chopra v John H Lithen | 5-7,3-6 |
| ITF M15 Fayetteville | 2023/10/30 15:00 | Franco Ribero v John H Lithen | 3-6,1-6 |
| ITF M25 Ystad | 2023/08/17 08:45 | Eero Vasa v John H Lithen | 7-5,6-2 |
| ITF M25 Ystad | 2023/08/16 10:55 | John H Lithen v Sebastian Gima | 7-6,7-5 |
| ITF M15 Frankfurt Am Main | 2023/08/09 15:20 | Philip Florig v John H Lithen | 6-3,6-1 |
| ITF M15 Frankfurt Am Main | 2023/08/07 13:00 | John H Lithen v Sven Corbinais | 6-3,6-1 |