Stadium: Pista 2 Round: 25 Ground: Clay
| ITF M15 Majadahonda | 2021/05/06 10:45 | Alex Rybakov v Daniel Rincon | 6-4,6-3 |
| ITF M15 Melilla | 2021/09/26 07:00 | Alex M Pujolras v Daniel Rincon | 6-2,6-1 |
| ITF M15 Melilla | 2021/09/25 12:10 | Daniel Rincon v Kirill Mishkin | 6-3,6-1 |
| ITF M15 Melilla | 2021/09/24 16:10 | Zakhar Trapeznikov v Daniel Rincon | 6-7,6-4,4-6 |
| Challenger Mallorca | 2021/08/31 12:55 | Daniel Rincon v Stefan Kozlov | 3-6,6-1,1-6 |
| ATP Mallorca | 2021/06/19 12:25 | Roberto Carballes Baena v Daniel Rincon | 6-2,6-1 |
| ITF M15 Valldoreix | 2021/05/12 07:55 | Louis Dussin v Daniel Rincon | 6-2,6-4 |
| ITF M15 Majadahonda | 2021/05/06 10:45 | Alex Rybakov v Daniel Rincon | 6-4,6-3 |
| ITF M15 Majadahonda | 2021/05/04 09:45 | Daniel Rincon v Pablo Vivero Gonzalez | 6-4,7-5 |
| 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 |
| Challenger Szczecin | 2021/09/14 10:00 | Danilo Petrovic v Alex Rybakov | 1-6,2-6 |
| Challenger Szczecin | 2021/09/13 09:00 | Jesper De Jong v Alex Rybakov | 6-3,3-6,2-6 |