| Challenger - Barcelone | 10/04 13:00 | 19 | [406] Denis Yevseyev v Nicolas Alvarez Varona [441] | 6-3,2-6,1-6 | |
| Challenger - Barcelone | 10/03 09:40 | 14 | Pla Malfeito, Jaume v Nicolas Alvarez Varona | 1-6,0-6 | |
| Challenger - Barcelone | 10/03 09:40 | 14 | Slobodchikov, Ronald v Nicolas Alvarez Varona | Cancelled | |
| Challenger Murcia | 09/27 09:00 | 19 | Nicolas Alvarez Varona v Mats Rosenkranz | Retired | |
| Challenger Murcia | 09/26 12:30 | 14 | Nicolas Alvarez Varona v Vernier, Michel | 6-2,7-5 | |
| ITF M25 Plaisir | 09/14 09:50 | 25 | Nicolas Alvarez Varona v Robin Bertrand | 5-7,3-6 | |
| Challenger Seville | 09/05 12:50 | 14 | Luciano Darderi v Nicolas Alvarez Varona | Retired | |
| Challenger Mallorca | 09/01 14:00 | 25 | Nicolas Alvarez Varona v Marcelo Tomas Barrios Vera | 4-6,6-7 | |
| ITF M25 Santander | 08/29 09:30 | 29 | Nicolas Alvarez Varona v Alex M Pujolras | 7-6,2-6,6-2 | |
| ITF M25 Santander | 08/28 10:55 | 28 | Juan Bautista Torres v Nicolas Alvarez Varona | 3-6,3-6 | |
| ITF M25 Santander | 08/27 14:30 | 27 | Rio Noguchi v Nicolas Alvarez Varona | 1-6,4-6 | |
| ITF M25 Santander | 08/26 08:55 | 26 | Louis Dussin v Nicolas Alvarez Varona | 2-6,5-7 | |
| ITF M25 Santander | 08/25 10:00 | 25 | Toledo Bague, Pol v Nicolas Alvarez Varona | 3-6,4-6 | |
| Prostejov, Singles M-ITF-CZE-04A | 08/18 10:05 | 26 | Alvarez Varona, Nicolas v Dalibor Svrcina | 5-7,2-6 | |
| Prostejov, Singles M-ITF-CZE-04A | 08/16 10:50 | 25 | Pospisil, Jaroslav v Alvarez Varona, Nicolas | 3-6,3-6 | |
| Challenger - Prague | 08/08 10:00 | 14 | Geoffrey Blancaneaux v Nicolas Alvarez Varona | 6-1,6-4 | |
| ITF M25 Bolzano | 08/03 07:00 | 25 | Andrea Picchione v Nicolas Alvarez Varona | 6-4,6-4 | |
| Challenger Pozoblanco | 07/19 16:30 | 25 | [319] Filip C Jianu v Nicolas Alvarez Varona [488] | 6-2,6-4 | |
| ITF M25 Bakio | 06/29 14:30 | 25 | Nicolas Alvarez Varona v Patael, Ben | 5-7,6-1,4-6 | |
| ITF M25 Alkmaar | 06/27 13:00 | 29 | Nicolas Alvarez Varona v Jelle Sels | 1-6,3-6 | |
| ITF M25 Alkmaar | 06/26 13:35 | 28 | Nicolas Alvarez Varona v Heyman, Christopher | 6-4,3-6,7-6 | |
| ITF M25 Alkmaar | 06/25 11:30 | 27 | Nicolas Alvarez Varona v Marvin Moeller | 6-1,6-4 | |
| ITF M25 Alkmaar | 06/24 15:00 | 26 | Nicolas Alvarez Varona v Carlos L-Montagud | 5-7,6-3,6-2 | |
| ITF M25 Alkmaar | 06/23 15:05 | 25 | Jesper De Jong v Nicolas Alvarez Varona | 4-6,6-4,4-6 | |
| ITF - M15 Héraklion | 06/10 09:25 | 26 | Nicolas Alvarez Varona v Roman A Burruchaga | 7-6,2-6,1-6 | |
| ITF - M15 Héraklion | 06/09 06:30 | 25 | Nicolas Alvarez Varona v Cohen, Eduardo | 6-2,6-2 | |
| ITF - M15 Héraklion | 06/05 08:10 | 28 | Patael, Ben v Nicolas Alvarez Varona | 7-5,6-2 | |
| ITF - M15 Héraklion | 06/04 06:25 | 27 | Nicolas Alvarez Varona v Ugo Blanchet | 6-1,7-5 | |
| ITF - M15 Héraklion | 06/03 09:30 | 26 | Nicolas Alvarez Varona v Breysach , Martin | 6-3,6-3 | |
| ITF - M15 Héraklion | 06/02 13:50 | 25 | Nicolas Alvarez Varona v Matteo De Vincentis | 6-4,6-2 |
Nicolás Álvarez Varona (born 18 May 2001) is a Spanish tennis player.
Álvarez Varona has a career high ATP singles ranking of World No. 219 achieved on 17 October 2022. He also has a career high ATP doubles ranking of World No. 288 achieved on 3 April 2023.
Álvarez Varona made his ATP main draw debut at the 2022 Barcelona Open Banc Sabadell after qualifying for the singles main draw, defeating Philipp Kohlschreiber and wildcard Max Alcalá Gurri before losing to Brandon Nakashima.
Ranked No. 927, at the 2024 Barcelona Open Banc Sabadell he entered the qualifying competition with a wildcard.