Stadium: Cancha 4 Round: 25 Ground: Clay
| Challenger Lima | 2021/09/28 16:45 | Nicolas Alvarez v Facundo Mena | 3-6,7-6,3-6 |
| Davis Cup | 2021/09/18 21:30 | Nicolas Alvarez v Nerman Fatic | 7-6,6-4 |
| Davis Cup | 2021/09/17 20:00 | Nicolas Alvarez v Damir Dzumhur | 2-6,7-6,3-6 |
| Challenger Banja Luka | 2021/09/07 08:00 | Nicolas Alvarez v Sumit Nagal | 1-6,2-6 |
| ITF M25 Oviedo | 2021/09/03 10:25 | Nicolas Alvarez v Oriol Roca Batalla | 1-6,6-3,5-7 |
| ITF M25 Oviedo | 2021/09/02 09:00 | Miguel Damas v Nicolas Alvarez | 6-1,3-6,4-6 |
| ITF M25 Oviedo | 2021/09/01 08:00 | Andrey Chepelev v Nicolas Alvarez | 6-4,1-6,3-6 |
| ITF M25 Oviedo | 2021/08/31 07:00 | Alejandro Mendoza v Nicolas Alvarez | 2-6,3-6 |
| Challenger Ambato | 2021/09/22 15:00 | Diego Hidalgo v Facundo Mena | 4-6,3-6 |
| Challenger Quito | 2021/09/13 20:00 | Roberto Quiroz v Diego Hidalgo | 6-4,7-5 |
| Challenger Pozoblanco | 2021/07/19 15:00 | Michael Geerts v Diego Hidalgo | 7-6,6-3 |
| Challenger Pozoblanco | 2021/07/18 17:45 | Carlos Matarredona Valor v Diego Hidalgo | 4-6,5-7 |
| Challenger Amersfoort | 2021/07/12 10:40 | Michael Geerts v Diego Hidalgo | 7-6,6-3 |
| Challenger Amersfoort | 2021/07/11 14:00 | Guy Den Ouden v Diego Hidalgo | 3-6,6-7 |
| Challenger Braunschweig | 2021/07/05 09:30 | Diego Hidalgo v Dayne Kelly | 3-6,7-6,3-6 |
| Challenger Braunschweig | 2021/07/04 10:10 | Igor Sijsling v Diego Hidalgo | 3-6,6-3,4-6 |