Stadium: Court 2 Round: 25 Ground: Hardcourt indoor
| ITF - St Petersburg M15 | 2021/04/05 08:35 | Ivan Nedelko v Martin Borisiouk | 6-2,6-1 |
| ITF - St Petersburg M15 | 2021/04/04 13:20 | Ivan Nedelko v Sergei Pogosian | 6-1,6-1 |
| Challenger Oeiras | 2021/03/28 10:00 | Francisco Cabral v Ivan Nedelko | 6-2,5-7,6-4 |
| Challenger Zadar | 2021/03/25 09:30 | Nikola Milojevic v Ivan Nedelko | 6-2,6-1 |
| Challenger Zadar | 2021/03/23 13:30 | Teymuraz Gabashvili v Ivan Nedelko | 2-6,6-2,3-6 |
| Challenger Zadar | 2021/03/22 09:00 | Ivan Nedelko v Nerman Fatic | 6-4,1-6,3-6 |
| Challenger Zadar | 2021/03/21 11:30 | Ivan Nedelko v Noa Vukadin | 4-6,6-2,6-1 |
| ITF - Rovinj M15 | 2021/03/18 09:00 | Ivan Nedelko v Timo Legout | 6-4,4-6,3-6 |
| ITF - St Petersburg M15 | 2021/02/11 11:10 | Evgeny Tyurnev v Petr Bar Biryukov | 6-2,7-5 |
| ITF - St Petersburg M15 | 2021/02/09 07:00 | Petr Bar Biryukov v Aleksei Abazov | 6-3,6-0 |
| ITF - St Petersburg M15 | 2021/02/03 09:10 | Bogdan Bobrov v Petr Bar Biryukov | 6-3,6-3 |
| ITF - St Petersburg M15 | 2021/02/01 08:00 | Petr Bar Biryukov v Alexandr Binda | 6-4,3-6,10-3 |
| ITF - St Petersburg M15 | 2021/01/31 10:00 | Lorenzo Bocchi v Petr Bar Biryukov | 4-6,4-6 |
| ITF - Cairo M15 | 2021/01/12 08:30 | Petr Bar Biryukov v Mathieu Perchicot | 1-6,1-6 |