| Challenger Murcia | 2021/09/30 10:30 | Roberto Carballes Baena v Alex Rybakov | 6-2,6-2 |
| Challenger Murcia | 2021/09/28 11:15 | Daniel Rincon v Alex Rybakov | 3-6,2-6 |
| Challenger Murcia | 2021/09/27 09:00 | Alex Rybakov v Carlos Sanchez Jover | 6-3,6-1 |
| Challenger Murcia | 2021/09/26 09:00 | Alex Rybakov v Davide Galoppini | 6-1,7-5 |
| Challenger Braga | 2021/09/21 12:10 | Andrea Collarini v Alex Rybakov | 6-2,6-2 |
| Challenger Braga | 2021/09/20 11:25 | Kaichi Uchida v Alex Rybakov | 6-3,7-5 |
| Challenger Braga | 2021/09/19 13:30 | Jeroen Vanneste v Alex Rybakov | 2-6,0-6 |
| Challenger Szczecin | 2021/09/16 17:00 | Nicola Kuhn v Alex Rybakov | 6-2,6-2 |