Stadium: Court 4 Round: 29 Ground: Hardcourt indoor
| ITF M15 St Petersburg | 2021/04/10 08:00 | Cozbinov, Alexander v Nedelko, Ivan | 6-2,4-6,3-6 |
| ITF M15 St Petersburg | 2021/04/09 08:00 | Nedelko, Ivan v Sarp Agabigun | 6-1,6-4 |
| ITF M15 St Petersburg | 2021/04/08 07:00 | Nedelko, Ivan v Simon Freund | 6-2,6-4 |
| ITF M15 St Petersburg | 2021/04/06 09:00 | Nedelko, Ivan v Petr Bar Biryukov | 6-3,6-1 |
| ITF M15 St Petersburg | 2021/04/05 08:35 | Nedelko, Ivan v Borisiouk, Martin | 6-2,6-1 |
| ITF M15 St Petersburg | 2021/04/04 13:20 | Nedelko, Ivan v Sergei Pogosian | 6-1,6-1 |
| Challenger - Oeiras | 2021/03/28 10:00 | Cabral, Francisco v Nedelko, Ivan | 6-2,5-7,6-4 |
| Challenger - Zadar | 2021/03/25 09:30 | Nikola Milojevic v Nedelko, Ivan | 6-2,6-1 |
| ITF M15 St Petersburg | 2021/04/10 08:00 | Satral, Jan v Illya Beloborodko | 5-7,3-6 |
| ITF M15 St Petersburg | 2021/04/09 10:50 | Illya Beloborodko v Yanki Erel | 7-6,2-6,6-3 |
| ITF M15 St Petersburg | 2021/04/07 09:55 | Illya Beloborodko v Constantin Bittoun Kouzmine | 6-3,6-1 |
| ITF M15 St Petersburg | 2021/04/04 07:00 | Shchaya-Zubrov, Pavel v Illya Beloborodko | 2-6,0-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/18 07:30 | Lucas Miedler v Illya Beloborodko | 7-6,6-1 |
| ITF - M15 Sharm El Sheikh | 2021/03/17 07:30 | Ozolins, Karlis v Illya Beloborodko | 2-6,1-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/16 07:30 | Giorgio Ricca v Illya Beloborodko | 6-7,4-6 |
| ITF - M15 Sharm El Sheikh | 2021/03/15 07:30 | Troche, Emiliano v Illya Beloborodko | 1-6,4-6 |