| ITF M25 Hamburg | 2021/10/17 17:15 | Daniel Little v Mateusz Terczynski | 6-4,6-0 |
| ITF M25 Hamburg | 2021/10/17 12:25 | Tom Clavel v Mateusz Terczynski | 4-6,1-6 |
| ITF M25 Prague | 2021/10/03 10:00 | Samuel Paulovcak v Mateusz Terczynski | 4-6,6-3,10-8 |
| Polish National Tour | 2021/07/13 11:50 | Mateusz Terczynski v Daniel Michalski | 2-6,1-6 |
| ITF M15 Poprad | 2021/07/05 08:00 | Illya Beloborodko v Mateusz Terczynski | 6-4,6-2 |
| ITF M15 Poprad | 2021/07/04 11:00 | Jakub Kroslak v Mateusz Terczynski | 6-2,6-7,9-11 |
| 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 | Mateusz Terczynski v Lukas Palovic | 6-3,6-1 |
| UTR Pro Tennis Series Dubai | 2022/01/03 06:00 | Igor Sijsling v Simon Roberts | 6-3,6-1 |
| Challenger Lisbon | 2021/09/27 15:10 | Igor Sijsling v Andrea Pellegrino | 0-6,4-6 |
| Challenger Braga | 2021/09/21 09:00 | Igor Sijsling v Michael Vrbensky | 1-6,4-6 |
| Challenger Prague | 2021/08/27 09:00 | Franco Agamenone v Igor Sijsling | 6-3,6-0 |
| Challenger Prague | 2021/08/26 10:00 | Igor Sijsling v Kaichi Uchida | 7-5,6-3 |
| Challenger Prague | 2021/08/24 13:45 | Daniel Siniakov v Igor Sijsling | 4-6,3-6 |
| Challenger Segovia | 2021/07/27 14:25 | Igor Sijsling v Teymuraz Gabashvili | 1-6,3-6 |
| Challenger Pozoblanco | 2021/07/22 16:00 | Tim Van Rijthoven v Igor Sijsling | 6-4,6-4 |