Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Sharm El Sheikh | 2021/10/11 07:30 | Szymon Kielan v Dean Cooper Kirby | 6-7,4-6 |
| ITF M15 Sharm El Sheikh | 2021/10/07 08:00 | Lorenzo Bocchi v Szymon Kielan | 7-6,6-1 |
| ITF M15 Sharm El Sheikh | 2021/10/06 08:00 | Szymon Kielan v Alexandros Skorilas | 6-4,6-2 |
| ITF M15 Vyshkovo | 2021/09/21 07:00 | Szymon Kielan v Artem Smirnov | 6-4,3-6,3-6 |
| Challenger Szczecin | 2021/09/12 09:00 | Szymon Kielan v Alex Rybakov | 2-6,6-2,3-6 |
| Challenger Warsaw | 2021/08/26 13:00 | Lucas Miedler v Szymon Kielan | 7-5,6-4 |
| Challenger Warsaw | 2021/08/25 08:00 | Szymon Kielan v Goncalo Oliveira | 7-5,6-0 |
| ITF M15 Lodz | 2021/08/19 10:30 | Daniel Michalski v Szymon Kielan | 3-6,7-5,6-3 |
| Challenger Pau | 2021/11/14 13:55 | Robin Bertrand v Sebastian Fanselow | 4-6,3-6 |
| ITF M15 Monastir | 2021/11/10 10:45 | Jarno Jans v Robin Bertrand | 6-3,7-5 |
| ITF M15 Monastir | 2021/11/04 12:30 | Ugo Blanchet v Robin Bertrand | 6-1,6-3 |
| ITF M15 Monastir | 2021/11/03 08:30 | Robin Bertrand v Gage Brymer | 7-6,6-2 |
| ITF M15 Monastir | 2021/11/01 13:00 | Robin Bertrand v Warren Wood | 6-4,3-6,10-8 |
| ITF M15 Monastir | 2021/11/01 08:00 | Robin Bertrand v Linghao Zhang | 6-3,6-3 |
| ITF M15 Monastir | 2021/10/28 09:20 | Viktor Jovic v Robin Bertrand | 0-6,7-6,7-5 |
| ITF M15 Monastir | 2021/10/26 10:00 | Robin Bertrand v Christoph Negritu | 6-2,3-6,6-2 |