| UTR Pro Tennis Series Bucharest | 2021/12/04 08:00 | Dan Alexandru Tomescu v Stefan A Andreescu | 3-6,2-6 |
| UTR Pro Tennis Series Bucharest | 2021/12/03 11:00 | Dan Alexandru Tomescu v Johann Willems | 6-7,6-7 |
| UTR Pro Tennis Series Bucharest | 2021/12/01 12:30 | Dan Alexandru Tomescu v Simon A Ivanov | 6-3,6-2 |
| UTR Pro Tennis Series Bucharest | 2021/11/30 11:00 | Dan Alexandru Tomescu v Dragos Constantin Ignat | 6-3,5-2 |
| ITF M15 Antalya | 2021/11/18 06:30 | Dan Alexandru Tomescu v Dragos Nicolae Madaras | 4-6,2-6 |
| ITF M15 Antalya | 2021/11/17 06:15 | Dan Alexandru Tomescu v Fermin Tenti | 6-1,6-3 |
| UTR Pro Tennis Series Brasov | 2021/10/30 06:30 | Dan Alexandru Tomescu v Vlad Andrei Dancu | 7-5,4-6,2-5 |
| UTR Pro Tennis Series Brasov | 2021/10/29 08:30 | Stefan A Andreescu v Dan Alexandru Tomescu | 6-3,5-7,1-6 |
| UTR Pro Tennis Series Dubai | 2022/01/08 04:30 | Kai Lemstra v Simon Roberts | 0-0 |
| UTR Pro Tennis Series Dubai | 2022/01/07 04:30 | Michael Zhu v Kai Lemstra | 7-6,6-2 |
| UTR Pro Tennis Series Dubai | 2022/01/06 06:00 | David Pichler v Kai Lemstra | 6-4,4-6,4-6 |
| UTR Pro Tennis Series Dubai | 2022/01/05 07:30 | Mircea-Alexandru Jecan v Kai Lemstra | 6-4,7-5 |
| UTR Pro Tennis Series Dubai | 2022/01/03 10:50 | Jonathan Eysseric v Kai Lemstra | 6-3,6-1 |
| German Championship | 2021/12/07 15:00 | Kai Lemstra v Tom Schonenberg | 3-6,0-6 |
| ITF M15 Heraklion | 2021/11/23 07:00 | Nicholas David Ionel v Kai Lemstra | 3-6,7-5,10-4 |
| ITF M15 Heraklion | 2021/11/22 08:00 | Sergis Kyratzis v Kai Lemstra | 4-6,2-6 |