| Challenger - Barcelona | 10/05 12:10 | 25 | [441] Nicolas Alvarez Varona v Jiri Lehecka [175] | 6-2,7-6 | |
| Challenger - Barcelona | 10/04 13:00 | 19 | [406] Denis Yevseyev v Nicolas Alvarez Varona [441] | 6-3,2-6,1-6 | |
| Challenger - Barcelona | 10/03 09:40 | 14 | Jaume Pla Malfeito v Nicolas Alvarez Varona | 1-6,0-6 | |
| Challenger - Barcelona | 10/03 09:40 | 14 | Ronald Slobodchikov v Nicolas Alvarez Varona | Cancelled | |
| Challenger - Múrcia | 09/27 09:00 | 19 | Nicolas Alvarez Varona v Mats Rosenkranz | Retired | |
| Challenger - Múrcia | 09/26 12:30 | 14 | Nicolas Alvarez Varona v Michel Vernier | 6-2,7-5 | |
| ITF - M25 Plaisir | 09/14 09:50 | 25 | Nicolas Alvarez Varona v Robin Bertrand | 5-7,3-6 | |
| Challenge - Sevilha | 09/05 12:50 | 14 | Luciano Darderi v Nicolas Alvarez Varona | Retired | |
| Challenger - Maiorca | 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 | Pol Toledo Bague v Nicolas Alvarez Varona | 3-6,4-6 | |
| ITF - M25 Prostějov | 08/18 10:05 | 26 | Nicolas A Varona v Dalibor Svrcina | 5-7,2-6 | |
| ITF - M25 Prostějov | 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 - 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 Ben Patael | 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 Christopher Heyman | 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 Heraklion | 06/10 09:25 | 26 | Nicolas Alvarez Varona v Roman A Burruchaga | 7-6,2-6,1-6 | |
| ITF - M15 Heraklion | 06/09 06:30 | 25 | Nicolas Alvarez Varona v Eduardo Cohen | 6-2,6-2 | |
| ITF - M15 Heraklion | 06/05 08:10 | 28 | Ben Patael v Nicolas Alvarez Varona | 7-5,6-2 | |
| ITF - M15 Heraklion | 06/04 06:25 | 27 | Nicolas Alvarez Varona v Ugo Blanchet | 6-1,7-5 | |
| ITF - M15 Heraklion | 06/03 09:30 | 26 | Nicolas Alvarez Varona v Martin Breysach | 6-3,6-3 |
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.