Stadium: Cancha Central Round: 25 Ground: Clay
| Challenger Segovia Qual | 2018/07/28 11:00 | Diego Hidalgo v Nicolas Alvarez Varona | 3-6,4-6 |
| ITF M25 Alkmaar | 2021/06/24 15:00 | Nicolas Alvarez Varona v Carlos Lopez Montagud | 5-7,6-3,6-2 |
| ITF M25 Alkmaar | 2021/06/23 15:05 | Jesper De Jong v Nicolas Alvarez Varona | 4-6,6-4,4-6 |
| ITF M15 Heraklion | 2021/06/10 09:25 | Nicolas Alvarez Varona v Roman Andres Burruchaga | 7-6,2-6,1-6 |
| ITF M15 Heraklion | 2021/06/09 06:30 | Nicolas Alvarez Varona v Eduardo Cohen | 6-2,6-2 |
| ITF M15 Heraklion | 2021/06/05 08:10 | Ben Patael v Nicolas Alvarez Varona | 7-5,6-2 |
| ITF M15 Heraklion | 2021/06/04 06:25 | Nicolas Alvarez Varona v Ugo Blanchet | 6-1,7-5 |
| ITF M15 Heraklion | 2021/06/03 09:30 | Nicolas Alvarez Varona v Martin Breysach | 6-3,6-3 |
| ITF M15 Heraklion | 2021/06/02 13:50 | Nicolas Alvarez Varona v Matteo De Vincentis | 6-4,6-2 |
| ITF M25 Tulsa | 2021/06/17 14:00 | Nicolas Kicker v Diego Hidalgo | 6-4,7-5 |
| ITF M25 Tulsa | 2021/06/16 17:10 | Strong Kirchheimer v Diego Hidalgo | 7-6,2-6,3-6 |
| ITF M25 Santo Domingo | 2021/06/10 12:50 | Evan Zhu v Diego Hidalgo | 6-2,6-3 |
| ITF M25 Santo Domingo | 2021/06/09 13:00 | Adam El Mihdawy v Diego Hidalgo | 4-6,6-7 |
| ITF M25 Santo Domingo | 2021/06/03 15:55 | Kyle Seelig v Diego Hidalgo | 6-2,6-4 |
| ITF M25 Santo Domingo | 2021/06/01 15:55 | Gerardo L Villasenor v Diego Hidalgo | 6-4,3-6,3-6 |
| Challenger Salinas 2 | 2021/04/27 16:15 | Adrian Menendez-Maceiras v Diego Hidalgo | 7-5,6-0 |
| Challenger Salinas | 2021/04/20 15:50 | Diego Hidalgo v Nicolas Mejia | 3-6,6-1,5-7 |