Stadion: Court 6 Round: 25 Ground: Clay
| Challenger - Biella | 2021/05/30 10:55 | Alexey Vatutin v Marco Bortolotti | 3-6,6-4,6-1 |
| ITF - M15 - Prijedor | 2021/05/11 09:35 | Denis Yevseyev v Marco Bortolotti | 7-6,6-3 |
| Challenger - Zadar | 2021/03/23 09:00 | Marco Bortolotti v Vit Kopriva | 1-6,3-6 |
| Challenger - Zadar | 2021/03/22 09:00 | Vladyslav Orlov v Marco Bortolotti | 6-2,6-7,6-7 |
| Challenger - Zadar | 2021/03/21 13:35 | Victor Vlad Cornea v Marco Bortolotti | 1-6,3-6 |
| ITF - M15 - Rovinj | 2021/03/16 10:30 | Corentin Denolly v Marco Bortolotti | 6-4,6-4 |
| ITF - M15 - Porec | 2021/03/10 09:00 | Marco Bortolotti v Matteo Arnaldi | 2-6,3-6 |
| Challenger - Gran Canaria - Qualifikation | 2021/02/28 14:55 | Marco Bortolotti v Pol Toledo Bague | 1-6,5-7 |
| ITF - M25 - Wroclaw | 2021/06/29 08:00 | Daniel Siniakov v Illya Beloborodko | 6-4,4-6,6-10 |
| ITF - M25 - Wroclaw | 2021/06/28 11:00 | Alessandro Procopio v Illya Beloborodko | 2-6,4-6 |
| ITF - M25 - Wroclaw | 2021/06/27 15:30 | Daniel Paty v Illya Beloborodko | 4-6,4-6 |
| ITF - M15 - Novomoskovsk | 2021/06/05 07:30 | Illya Beloborodko v Matias Zukas | 5-7,4-6 |
| ITF - M15 - Novomoskovsk | 2021/06/04 14:20 | Yurii Dzhavakian v Illya Beloborodko | 3-6,5-7 |
| ITF - M15 - Novomoskovsk | 2021/06/04 11:10 | Illya Beloborodko v Oleksii Krutykh | 3-6,6-2,10-6 |
| ITF - M15 - Novomoskovsk | 2021/06/03 17:20 | Illya Beloborodko v Nikita Alosha | 6-3,2-6,10-5 |
| ITF - M15 - Novomoskovsk | 2021/05/23 06:00 | Illya Beloborodko v Bruno P Navarro | 2-6,6-2,7-10 |