| 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 Michel Vernier | 6-2,7-5 | |
| ITF - Plaisir M25 | 09/14 09:50 | 25 | Nicolas Alvarez Varona v Robin Bertrand | 5-7,3-6 | |
| Challenger Sewilla | 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 - Santander M25 | 08/29 09:30 | 29 | Nicolas Alvarez Varona v Alex M Pujolras | 7-6,2-6,6-2 | |
| ITF - Santander M25 | 08/28 10:55 | 28 | Juan Bautista Torres v Nicolas Alvarez Varona | 3-6,3-6 | |
| ITF - Santander M25 | 08/27 14:30 | 27 | Rio Noguchi v Nicolas Alvarez Varona | 1-6,4-6 | |
| ITF - Santander M25 | 08/26 08:55 | 26 | Louis Dussin v Nicolas Alvarez Varona | 2-6,5-7 | |
| ITF - Santander M25 | 08/25 10:00 | 25 | Pol Toledo Bague v Nicolas Alvarez Varona | 3-6,4-6 | |
| ITF - Prostejov M25 | 08/18 10:05 | 26 | Nicolas A Varona v Dalibor Svrcina | 5-7,2-6 | |
| ITF - Prostejov M25 | 08/16 10:50 | 25 | Jaroslav Pospisil v Nicolas A Varona | 3-6,3-6 | |
| Challenger Praga | 08/08 10:00 | 14 | Geoffrey Blancaneaux v Nicolas Alvarez Varona | 6-1,6-4 | |
| ITF - Bolzano M25 | 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 - Bakio M25 | 06/29 14:30 | 25 | Nicolas Alvarez Varona v Ben Patael | 5-7,6-1,4-6 | |
| ITF - Alkmaar M25 | 06/27 13:00 | 29 | Nicolas Alvarez Varona v Jelle Sels | 1-6,3-6 | |
| ITF - Alkmaar M25 | 06/26 13:35 | 28 | Nicolas Alvarez Varona v Christopher Heyman | 6-4,3-6,7-6 | |
| ITF - Alkmaar M25 | 06/25 11:30 | 27 | Nicolas Alvarez Varona v Marvin Moeller | 6-1,6-4 | |
| ITF - Alkmaar M25 | 06/24 15:00 | 26 | Nicolas Alvarez Varona v Carlos L-Montagud | 5-7,6-3,6-2 | |
| ITF - Alkmaar M25 | 06/23 15:05 | 25 | Jesper De Jong v Nicolas Alvarez Varona | 4-6,6-4,4-6 | |
| ITF - Heraklion M15 | 06/10 09:25 | 26 | Nicolas Alvarez Varona v Roman A Burruchaga | 7-6,2-6,1-6 | |
| ITF - Heraklion M15 | 06/09 06:30 | 25 | Nicolas Alvarez Varona v Eduardo Cohen | 6-2,6-2 | |
| ITF - Heraklion M15 | 06/05 08:10 | 28 | Ben Patael v Nicolas Alvarez Varona | 7-5,6-2 | |
| ITF - Heraklion M15 | 06/04 06:25 | 27 | Nicolas Alvarez Varona v Ugo Blanchet | 6-1,7-5 | |
| ITF - Heraklion M15 | 06/03 09:30 | 26 | Nicolas Alvarez Varona v Martin Breysach | 6-3,6-3 | |
| ITF - Heraklion M15 | 06/02 13:50 | 25 | Nicolas Alvarez Varona v Matteo De Vincentis | 6-4,6-2 | |
| ITF - Marbella M15 | 05/29 07:55 | 28 | Yannick Mertens v Nicolas Alvarez Varona | 1-6,7-5,6-3 | |
| ITF - Marbella M15 | 05/28 08:00 | 27 | Nicolas Alvarez Varona v Imanol L Morillo | 6-2,4-6,6-4 | |
| ITF - Marbella M15 | 05/27 09:00 | 26 | Nicolas Alvarez Varona v Max Alcala Gurri | 6-4,6-1 |
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.