| ITF Spain F28 | 09/18 08:00 | 25 | Marc Fornell-Mestres v Nicolas Alvarez Varona | 7-5,3-6,6-2 | |
| ITF Portugal F16 | 08/25 10:30 | 28 | Nicolas Alvarez Varona v Tiago Cacao | 2-6,7-6,3-6 | |
| ITF Portugal F16 | 08/24 09:00 | 27 | Antoine C Chauvinc v Nicolas Alvarez Varona | 7-5,4-6,3-6 | |
| ITF Portugal F16 | 08/23 09:00 | 26 | Finn Bass v Nicolas Alvarez Varona | Retired | |
| ITF Portugal F16 | 08/22 09:00 | 25 | Nicolas Alvarez Varona v Robin Kern | 6-2,6-2 | |
| ITF Portugal F16 | 08/20 09:00 | 62 | Nicolas Alvarez Varona v Eduardo Ribeiro | 6-3,7-5 | |
| ITF Portugal F16 | 08/19 11:30 | 62 | Nicolas Alvarez Varona v Eduardo Morais | 6-1,6-1 | |
| ITF Portugal F16 | 08/18 08:30 | 62 | Nicolas Alvarez Varona v Illia Stoliar | 6-1,6-1 | |
| Challenger Segovia Qual | 07/30 10:30 | 54 | Yannick Jankovits v Nicolas Alvarez Varona | 7-6,6-1 | |
| Challenger Segovia Qual | 07/29 09:00 | 46 | Nicolas Alvarez Varona v Viktor Durasovic | 6-3,7-6 | |
| Challenger Segovia Qual | 07/28 11:00 | 45 | Diego Hidalgo v Nicolas Alvarez Varona | 3-6,4-6 | |
| ITF Spain F12 | 05/24 09:00 | 26 | Nicolas Alvarez Varona v Sergio Martos Gornes | 4-6,6-7 | |
| ITF Spain F12 | 05/23 10:40 | 25 | Nicolas Alvarez Varona v Jordi Mas De Ugarte | 6-2,6-2 | |
| ATP Madrid Qual | 05/05 16:35 | 45 | Nicolas Alvarez Varona v Mirza Basic | 6-3,6-7,2-6 | |
| ITF Spain F9 | 04/19 09:00 | 26 | Patricio Heras v Nicolas A Varona | 6-7,6-3,6-2 | |
| ITF Spain F9 | 04/18 13:40 | 25 | Jordan Correia v Nicolas A Varona | 5-7,5-7 | |
| ITF Spain F9 Qual | 04/16 11:10 | 62 | Nicolas Alvarez Varona v Federico Moreno | 7-5,7-6 | |
| ITF Spain F9 Qual | 04/15 10:30 | 62 | Oleg Prihodko v Nicolas Alvarez Varona | 2-6,2-6 | |
| ITF Spain F9 Qual | 04/14 12:15 | 62 | Nicolas Alvarez Varona v Adrian Exposito | 6-1,6-0 | |
| ITF Tunisia F1 | 01/11 11:15 | 26 | Peter Nagy v Nicolas Alvarez Varona | Retired | |
| ITF Tunisia F1 | 01/09 12:15 | 25 | Julian Ocleppo v Nicolas Alvarez Varona | 5-7,6-7 | |
| Challenger Segovia | 07/31 12:00 | 25 | Nicolas Alvarez Varona v Benjamin Bonzi | 0-6,2-6 | |
| ITF Portugal F13 | 07/26 15:30 | 25 | Adil Kalyanpur v Nicolas Alvarez Varona | Cancelled | |
| ITF Portugal F12 | 07/22 09:30 | 28 | Nicolas A Varona v David Perez Sanz | 6-7,7-5,5-7 | |
| ITF Portugal F12 | 07/21 11:00 | 27 | Nicolas A Varona v Jonathan Gray | 7-6,6-3 | |
| ITF Portugal F12 | 07/20 16:20 | 26 | Bruno Mardones v Nicolas A Varona | 4-6,6-4,0-6 | |
| ITF Portugal F12 | 07/19 11:55 | 25 | Adil Kalyanpur v Nicolas A Varona | 1-6,2-6 | |
| ITF Portugal F12 | 07/18 08:00 | 62 | Max Colorado v Nicolas Alvarez Varona | 4-6,6-2,5-7 | |
| ITF Portugal F12 | 07/17 08:30 | 62 | Andre Rodeia v Nicolas Alvarez Varona | 2-6,3-6 | |
| ITF Portugal F12 | 07/15 12:00 | 62 | Mario Mansilla Diez v Nicolas Alvarez Varona | 2-6,5-7 |
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.