Stadium: Court 1 Round: 25 Ground: Clay
| Challenger - Varšava | 2021/08/25 08:00 | Daniel Michalski v Nino Serdarusic | 3-6,4-6 |
| Challenger - Varšava | 2021/08/23 09:00 | Christopher Heyman v Daniel Michalski | 5-7,3-6 |
| Challenger - Varšava | 2021/08/22 09:00 | Wojciech Marek v Daniel Michalski | 6-7,1-6 |
| ITF - M15 Lodz | 2021/08/20 10:15 | Daniel Michalski v Gilbert S K Junior | 6-4,3-6,3-6 |
| ITF - M15 Lodz | 2021/08/19 10:30 | Daniel Michalski v Szymon Kielan | 3-6,7-5,6-3 |
| ITF - M15 Lodz | 2021/08/18 11:40 | Daniel Michalski v Piotr Grynkowski | 6-1,6-1 |
| ITF - M15 Gdynia | 2021/08/13 12:00 | Daniel Michalski v Fabian Marozsan | 4-6,3-6 |
| ITF - M15 Gdynia | 2021/08/12 10:30 | Daniel Michalski v Michal Dembek | 7-6,4-6,6-3 |
| US Open | 2021/08/24 17:15 | Francisco Cerundolo v Thai-Son Kwiatkowski | 6-0,6-7,6-4 |
| ATP - Newport | 2021/07/11 20:10 | Ulises Blanch v Thai-Son Kwiatkowski | 2-6,6-2,7-6 |
| Wimbledon | 2021/06/22 10:00 | Thai-Son Kwiatkowski v Antoine Hoang | 6-3,3-6,4-6 |
| Challenger - Orlando | 2021/06/09 16:00 | Thai-Son Kwiatkowski v Ulises Blanch | 6-7,6-3,2-6 |
| Challenger - Orlando | 2021/06/08 16:10 | Ernesto Escobedo v Thai-Son Kwiatkowski | 4-6,6-7 |
| Challenger - Little Rock | 2021/06/04 21:45 | Jack Sock v Thai-Son Kwiatkowski | 6-7,7-6,6-4 |
| Challenger - Little Rock | 2021/06/03 16:00 | Alexander Ritschard v Thai-Son Kwiatkowski | 7-5,3-6,2-6 |
| Challenger - Little Rock | 2021/06/02 20:40 | Stefan Kozlov v Thai-Son Kwiatkowski | 2-6,1-6 |