Stadium: TK PALILULA C3 Round: 62 Ground: Clay
| ITF M25 Belgrade | 2021/06/27 12:00 | Martin Zeljenka v George Gregoriou | 6-1,6-1 |
| ITF M15 Sibenik | 2021/05/17 11:00 | Martin Zeljenka v Martin Breysach | 6-7,3-6 |
| ITF M15 Sibenik | 2021/05/16 07:30 | Joris Hoogland v Martin Zeljenka | 6-7,3-6 |
| ITF M15 Prijedor | 2021/05/09 09:30 | Kristijan Juhas v Martin Zeljenka | 6-1,6-1 |
| ITF M15 Sibenik | 2021/04/19 12:20 | Gorazd Srbljak v Martin Zeljenka | 6-0,6-2 |
| ITF M15 Sibenik | 2021/04/18 10:00 | Martin Zeljenka v Anze Arh | 7-5,1-6,10-3 |
| ITF M15 Szekesfehervar | 2019/09/01 10:30 | Martin Zeljenka v Tomas Liska | 4-6,2-6 |
| ITF M25 Gyor | 2019/08/25 09:00 | Martin Zeljenka v Mate Voros | 3-6,6-7 |
| ITF M25 Belgrade | 2021/06/27 12:00 | Nemanja Malesevic v Matvey Minin | 6-4,6-7,10-12 |
| ITF M15 Bergamo | 2021/06/21 09:55 | Matvey Minin v Kirill Kivattsev | 2-6,4-6 |
| ITF M25 Grasse | 2021/06/14 09:25 | Matvey Minin v Rayane Stable | 5-7,3-6 |
| ITF M15 Helsinki | 2021/06/03 07:00 | Matvey Minin v Clement Tabur | 3-6,3-6 |
| ITF M15 Helsinki | 2021/06/02 06:30 | Iiro Vasa v Matvey Minin | 2-6,4-6 |
| ITF M15 Helsinki | 2021/06/01 07:00 | Matvey Minin v Daniel Svensson | 6-3,6-4 |
| ITF M15 Helsinki | 2021/05/31 08:30 | Matvey Minin v Hermanni Tiainen | 7-6,6-1 |
| ITF M25 Vic | 2021/05/16 11:00 | Inaki Cabrera Bello v Matvey Minin | 6-4,4-6,11-9 |