Stadium: Court 4 Round: 26 Ground: Clay
| ITF M15 Antalya | 2021/05/11 09:00 | Oleksii Krutykh v Naoki Nakagawa | 2-6,6-4,5-7 |
| ITF M15 Monastir | 2021/03/14 08:30 | Naoki Nakagawa v Franco Agamenone | 7-6,6-4 |
| ITF M15 Monastir | 2021/03/12 08:30 | Naoki Nakagawa v Simon Carr | 6-4,6-4 |
| ITF M15 Monastir | 2021/03/11 08:30 | Yannick Mertens v Naoki Nakagawa | 6-4,3-6,4-6 |
| ITF M15 Monastir | 2021/03/09 08:30 | Tomas Lipovsek Puches v Naoki Nakagawa | 2-6,2-6 |
| ITF M15 Monastir | 2021/03/03 08:30 | Renta Tokuda v Naoki Nakagawa | 6-1,6-3 |
| ITF M15 Monastir | 2021/03/01 12:30 | Naoki Nakagawa v Noah Lopez | 6-3,6-3 |
| ITF M15 Monastir | 2021/03/01 08:00 | Naoki Nakagawa v Sami Ben Abdennibi | 6-2,6-1 |
| ITF M15 Antalya | 2021/05/11 07:00 | Umut Akkoyun v Ivan Nedelko | 2-6,0-6 |
| ITF M15 St Petersburg | 2021/04/11 09:00 | Ivan Nedelko v Illya Beloborodko | 2-6,7-5,6-4 |
| ITF M15 St Petersburg | 2021/04/10 08:00 | Alexander Cozbinov v Ivan Nedelko | 6-2,4-6,3-6 |
| ITF M15 St Petersburg | 2021/04/09 08:00 | Ivan Nedelko v Sarp Agabigun | 6-1,6-4 |
| ITF M15 St Petersburg | 2021/04/08 07:00 | Ivan Nedelko v Simon Freund | 6-2,6-4 |
| ITF M15 St Petersburg | 2021/04/06 09:00 | Ivan Nedelko v Petr Bar Biryukov | 6-3,6-1 |
| ITF M15 St Petersburg | 2021/04/05 08:35 | Ivan Nedelko v Martin Borisiouk | 6-2,6-1 |
| ITF M15 St Petersburg | 2021/04/04 13:20 | Ivan Nedelko v Sergei Pogosian | 6-1,6-1 |