Stadium: Court 11 Round: 26 Ground: Clay
| ITF - Majadahonda M15 | 2021/05/05 11:55 | Max Alcala Gurri v Alex Rybakov | 0-6,4-6 |
| Challenger Tallahassee | 2021/04/20 23:20 | Alex Rybakov v Denis Kudla | 6-3,5-7,1-6 |
| Challenger Tallahassee | 2021/04/19 15:00 | Orlando Luz v Alex Rybakov | 2-6,3-6 |
| Challenger Tallahassee | 2021/04/18 21:40 | Alex Rybakov v Michael Geerts | 7-6,7-6 |
| ITF - Opatija M15 | 2021/03/26 09:00 | Alex Rybakov v Giacomo Dambrosi | 2-6,6-3,2-6 |
| ITF - Opatija M15 | 2021/03/25 11:50 | Alex Rybakov v Francesco Maestrelli | 6-3,7-5 |
| ITF - Opatija M15 | 2021/03/24 10:30 | Alex Rybakov v Fermin Tenti | 7-6,6-2 |
| ITF - Rovinj M15 | 2021/03/18 10:30 | Alex Rybakov v Andrea Basso | 6-1,2-6,5-7 |
| ITF - Majadahonda M15 | 2021/05/04 09:45 | Daniel Rincon v Pablo Vivero Gonzalez | 6-4,7-5 |
| ITF - LPD Gran Canaria M15 | 2021/04/28 14:25 | Daniel Rincon v Nicolas Moreno De Alboran | 6-2,4-6,4-6 |
| ITF M15 Las Palmas | 2021/04/26 08:30 | Xavier Gabarro v Daniel Rincon | 3-6,0-6 |
| ITF M15 Las Palmas | 2021/04/25 11:00 | Alessandro Coppini v Daniel Rincon | 0-6,5-7 |
| ITF - Antalya M15 | 2021/02/21 06:00 | Daniel Rincon v Taiyo Yamanaka | 6-3,0-6,4-10 |
| ITF - Antalya M15 | 2021/02/14 12:00 | Daniel Rincon v Federico Arnaboldi | 3-6,3-6 |
| ITF - Antalya M15 | 2021/02/09 07:00 | Daniel Rincon v Dragos Nicolae Madaras | 4-6,6-3,5-10 |
| ITF - Antalya M15 | 2021/02/08 07:00 | Gianmarco Ferrari v Daniel Rincon | 7-6,2-6,2-10 |