Stadium: Court 2 Opatija Round: 62 Ground: Clay
| ITF M15 Antalya | 2021/03/12 07:00 | Matheus Pucinelli De Almeida v Oleksandr Ovcharenko | 6-3,6-2 |
| ITF M15 Antalya | 2021/03/12 07:00 | Matheus Almeida v Oleksandr Ovcharenko | 6-3,6-2 |
| ITF M15 Antalya | 2021/03/10 11:20 | Oleksandr Ovcharenko v Mathys Erhard | 6-3,7-6 |
| ITF M15 Antalya | 2021/03/09 07:00 | Stefan Palosi v Oleksandr Ovcharenko | 4-6,3-6 |
| ITF M15 Antalya | 2021/03/08 10:00 | Peter Makk v Oleksandr Ovcharenko | 2-6,0-6 |
| ITF M15 Antalya | 2021/03/07 07:00 | Credit Chaiyarin v Oleksandr Ovcharenko | 1-6,2-6 |
| ITF M15 Antalya | 2021/03/02 07:00 | Oleksandr Ovcharenko v Sebastian Gima | 6-7,6-4,9-11 |
| ITF M15 Antalya | 2021/02/28 07:00 | Oleksandr Ovcharenko v Michalis Sakellaridis | 6-2,6-2 |
| ITF M15 Rovinj | 2021/03/15 11:00 | Josip Krstanovic v Federico Arnaboldi | 1-6,2-6 |
| ITF M15 Rovinj | 2021/03/14 08:30 | Josip Krstanovic v Mattia Frinzi | 6-2,7-6 |
| ITF M15 Porec | 2021/03/07 12:00 | Damien Wenger v Josip Krstanovic | 7-6,6-0 |
| ITF M15 Antalya | 2021/02/21 13:00 | Josip Krstanovic v Calin Manda | 2-6,3-6 |
| ITF M15 Antalya | 2021/01/18 07:00 | Josip Krstanovic v Federico Arnaboldi | 3-6,4-6 |
| ITF M15 Antalya | 2021/01/17 09:00 | Josip Krstanovic v Andrea Fiorentini | 6-0,6-4 |
| ITF M15 Antalya | 2021/01/10 06:00 | Calin Manda v Josip Krstanovic | 6-3,6-2 |
| ITF M15 Antalya | 2021/01/04 07:00 | Josip Krstanovic v Stefanos Sakellaridis | 3-6,6-7 |