Stadium: Court 2 Round: 26 Ground: Clay
| ITF M15 Gdynia | 2021/08/11 14:25 | Luke Johnson v Szymon Kielan | 1-6,6-7 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/04 17:10 | David Poljak v Szymon Kielan | 7-5,6-3 |
| Polish National Tour | 2021/07/11 10:00 | Kamil Majchrzak v Szymon Kielan | 6-1,7-6 |
| ITF M25 Wroclaw | 2021/06/30 13:15 | Gonzalo Lama v Szymon Kielan | 6-1,6-2 |
| ITF M25 Wroclaw | 2021/06/29 08:00 | Szymon Kielan v Mateusz Terczynski | 6-3,6-2 |
| ITF M25 Wroclaw | 2021/06/28 11:00 | Lewie Lane v Szymon Kielan | 3-6,0-6 |
| ITF M25 Wroclaw | 2021/06/27 12:30 | Szymon Kielan v Stepan Pecak | 4-6,6-4,10-8 |
| ITF M25 Poznan | 2020/08/23 11:00 | Leyton Rivera v Szymon Kielan | 4-6,6-3,10-3 |
| ITF M15 Gdynia | 2021/08/10 14:10 | Alexis Musialek v Patrik Niklas-Salminen | 6-4,6-3 |
| ITF M15 Perugia | 2021/07/21 12:00 | Andrea Basso v Alexis Musialek | 6-2,6-3 |
| ITF M15 L'Aquila | 2021/07/15 10:25 | Gianmarco Ferrari v Alexis Musialek | 6-3,6-1 |
| ITF M15 L'Aquila | 2021/07/14 09:20 | Nicolo Turchetti v Alexis Musialek | 2-6,4-6 |
| ITF M15 Antalya | 2021/06/30 06:30 | Alexis Musialek v Marsel Ilhan | 7-6,4-6,0-6 |
| ITF M25 Grasse | 2021/06/16 13:00 | Franco Agamenone v Alexis Musialek | 6-2,6-2 |
| ITF M15 Heraklion | 2021/06/12 07:00 | Alexis Musialek v Ben Patael | 1-6,1-6 |
| ITF M15 Heraklion | 2021/06/11 09:20 | Alexis Musialek v Yasha Zemel | 7-6,3-6,6-1 |