Stadium: Pista 2 Round: 14 Ground: Clay
| Challenger Porto | 2021/06/27 11:30 | Cabral, Francisco v Slobodchikov, Ronald | 6-2,6-2 |
| Challenger - Aix en Provence | 2021/06/13 08:30 | Slobodchikov, Ronald v Oscar Jose Gutierrez | 1-6,4-6 |
| Challenger Biella | 2021/05/30 13:30 | Slobodchikov, Ronald v Camilo Ugo Carabelli | 2-6,1-6 |
| Challenger - Oeiras | 2021/05/23 10:00 | Lucas Catarina v Slobodchikov, Ronald | 6-1,6-3 |
| UTR Pro Tennis Series Barcelona | 2021/05/02 07:00 | Slobodchikov, Ronald v Dzhavakian, Yurii | 4-6,2-6 |
| UTR Pro Tennis Series Barcelona | 2021/04/28 09:30 | Slobodchikov, Ronald v Toledo Bague, Pol | 2-6,2-6 |
| UTR Pro Tennis Series Barcelona | 2021/04/27 09:30 | Slobodchikov, Ronald v Noah Lopez | 2-6,4-6 |
| UTR Pro Tennis Series Barcelona | 2021/04/26 09:30 | Calvo Barcelo, Fermin v Slobodchikov, Ronald | 4-6,3-6 |
| Challenger Murcia | 2021/09/26 12:30 | Nicolas Alvarez Varona v Vernier, Michel | 6-2,7-5 |
| ITF M25 Plaisir | 2021/09/14 09:50 | Nicolas Alvarez Varona v Robin Bertrand | 5-7,3-6 |
| Challenger Mallorca | 2021/09/01 14:00 | Nicolas Alvarez Varona v Tomas Barrios Vera | 4-6,6-7 |
| ITF M25 Santander | 2021/08/29 09:30 | Nicolas Alvarez Varona v Alex M Pujolras | 7-6,2-6,6-2 |
| ITF M25 Santander | 2021/08/28 10:55 | Juan Bautista Torres v Nicolas Alvarez Varona | 3-6,3-6 |
| ITF M25 Santander | 2021/08/27 14:30 | Rio Noguchi v Nicolas Alvarez Varona | 1-6,4-6 |
| ITF M25 Santander | 2021/08/26 08:55 | Louis Dussin v Nicolas Alvarez Varona | 2-6,5-7 |
| ITF M25 Santander | 2021/08/25 10:00 | Toledo Bague, Pol v Nicolas Alvarez Varona | 3-6,4-6 |