Stadium: Court 1 Round: 44 Ground: Clay
| ITF M25 Pitesti | 2021/08/01 13:30 | Martin Zeljenka v Samuil Konov | 6-4,6-4 |
| ITF M15 Novi Sad | 2021/07/25 07:00 | Martin Zeljenka v Danilo Raicevic | 4-6,4-6 |
| ITF M25 Kottingbrunn | 2021/07/19 12:25 | Peter Goldsteiner v Martin Zeljenka | 6-4,7-6 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Martin Zeljenka v Rafael Kis Balazs | 2-6,6-4,10-2 |
| ITF M25 Belgrade | 2021/06/29 07:00 | Bogdan Pavel v Martin Zeljenka | 6-1,6-3 |
| ITF M25 Belgrade | 2021/06/28 10:00 | Martin Zeljenka v Matvey Minin | 7-5,6-3 |
| 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 M25 Belgrade | 2021/06/28 07:00 | Daniel Cukierman v Vladislav Melnic | 6-3,6-1 |
| ITF M25 Belgrade | 2021/06/27 07:00 | Vladislav Melnic v Luka Vukovic | 7-5,6-2 |
| ITF M15 Antalya | 2021/06/22 06:50 | Lorenzo Joaquin Rodriguez v Vladislav Melnic | 3-6,6-2,11-9 |
| ITF M15 Antalya | 2021/06/21 08:25 | Sergo Sikharulidze v Vladislav Melnic | 7-6,4-6,2-10 |
| ITF M15 Antalya | 2021/06/20 07:00 | S Mert Ozdemir v Vladislav Melnic | 1-6,2-6 |
| ITF M15 Antalya | 2021/06/15 07:15 | Pawel Juszczak v Vladislav Melnic | 5-7,6-2,10-3 |
| ITF M15 Antalya | 2021/06/14 12:55 | Lorenzo Joaquin Rodriguez v Vladislav Melnic | 2-6,6-1,8-10 |
| ITF M15 Antalya | 2021/06/13 07:30 | Osmancan Soyler v Vladislav Melnic | 0-6,3-6 |