Stadium: Grandstand 4 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Porec | 2020/03/11 10:40 | Pawel Juszczak v Colin Sinclair | 6-2,6-4 |
| ITF M25 Poznan | 2021/08/29 09:00 | Pawel Juszczak v Roman Andres Burruchaga | 7-5,3-6,2-6 |
| ITF M25 Poznan | 2021/08/28 11:00 | Shintaro Mochizuki v Pawel Juszczak | 7-5,5-7,1-6 |
| ITF M25 Poznan | 2021/08/27 11:30 | Pawel Juszczak v Igor Marcondes | 6-2,5-7,6-4 |
| ITF M25 Poznan | 2021/08/26 08:55 | Pawel Juszczak v Aleksander Orlikowski | 6-1,6-0 |
| ITF M25 Poznan | 2021/08/25 08:00 | Filip Peliwo v Pawel Juszczak | 5-7,0-6 |
| ITF M15 Lodz | 2021/08/20 10:00 | Pawel Juszczak v Maciej Rajski | 6-7,3-6 |
| ITF M15 Lodz | 2021/08/19 11:05 | Filip Kolasinski v Pawel Juszczak | 6-3,2-6,2-6 |
| ITF M15 Lodz | 2021/08/18 08:00 | Leonardo Aboian v Pawel Juszczak | 2-6,6-2,3-6 |
| ITF M25 Ricany | 2021/08/31 09:35 | Mateus Alves v Colin Sinclair | 6-7,6-3,6-4 |
| ITF M15 Huy | 2021/08/24 13:00 | Raphael Collignon v Colin Sinclair | 4-6,7-6,6-2 |
| UTR Pro Tennis Series Portoroz | 2021/08/21 09:30 | Oleksandr Bielinskyi v Colin Sinclair | 3-6,3-4 |
| UTR Pro Tennis Series Portoroz | 2021/08/20 11:00 | Colin Sinclair v Tilen Zitnik | 6-3,6-1 |
| UTR Pro Tennis Series Portoroz | 2021/08/19 15:30 | Colin Sinclair v Aleksa Pisaric | 6-3,5-2 |
| UTR Pro Tennis Series Portoroz | 2021/08/18 12:30 | Yanais Laurent v Colin Sinclair | 5-7,5-7 |
| UTR Pro Tennis Series Portoroz | 2021/08/17 11:00 | Jan Vehovec v Colin Sinclair | 2-6,1-5 |
| ITF M15 Sofia | 2021/07/06 09:50 | Colin Sinclair v Dragos Nicolae Madaras | 3-6,2-6 |