Stadium: Court 1 Round: 26 Ground: Hardcourt outdoor
| ITF - M25 Quinta Do Lago | 2021/10/20 15:15 | Veldheer, Mick v Romios, Matthew Christopher | 6-2,4-6,6-1 |
| ITF - M25 Loulé | 2021/10/13 09:30 | Veldheer, Mick v Adria Soriano Barrera | 1-6,4-6 |
| ITF - M25 Setubal | 2021/10/05 14:50 | Alberto Barroso Campos v Veldheer, Mick | 6-3,7-5 |
| ITF M15 Allershausen | 2021/09/05 11:00 | Guy Den Ouden v Veldheer, Mick | 6-0,6-4 |
| ITF M15 Allershausen | 2021/09/04 10:00 | Veldheer, Mick v David Jorda Sanchis | 6-3,6-7,6-1 |
| ITF M15 Allershausen | 2021/09/03 10:00 | Manish Sureshkumar v Veldheer, Mick | 1-6,6-4,0-6 |
| ITF M15 Allershausen | 2021/09/02 11:45 | Maximilian Homberg v Veldheer, Mick | 3-6,2-6 |
| ITF M15 Allershausen | 2021/08/31 11:25 | Schmitz, Constantin v Veldheer, Mick | 6-7,4-6 |
| ITF - M25 Quinta Do Lago | 2021/10/20 10:30 | Alan F R Fierros v Anton Matusevich | 0-6,4-6 |
| Challenger Biel | 2021/09/20 09:00 | Hiroki Moriya v Anton Matusevich | 6-4,5-7,6-4 |
| Challenger Biel | 2021/09/19 08:00 | Anton Matusevich v Bega, Alessandro | 6-2,6-1 |
| ITF M25 Sintra | 2021/09/09 11:25 | Anton Matusevich v Paul Jubb | 6-7,6-7 |
| ITF M25 Sintra | 2021/09/08 09:00 | Anton Matusevich v Daniel Little | 6-4,6-4 |
| ITF M25 Idanha-A-Nova | 2021/07/23 09:00 | Anton Matusevich v Soares Klier, Gilbert | 3-6,3-6 |
| ITF M25 Idanha-A-Nova | 2021/07/22 11:55 | Anton Matusevich v Faria, Luis | 6-3,2-6,7-6 |
| ITF M25 Idanha-A-Nova | 2021/07/20 10:45 | Anton Matusevich v Naoki Tajima | 6-3,7-5 |