| ITF Portugal F12 | 07/15 12:00 | 62 | Mario Mansilla Diez v Nicolas Alvarez Varona | 2-6,5-7 | |
| ITF Spain F17 | 06/10 08:45 | 62 | Miguel Vallejo v Nicolas Alvarez Varona | 6-4,6-1 | |
| ITF Tunisia F2 | 01/15 08:00 | 62 | Alexander Lebedyn v Nicolas Alvarez Varona | Retired | |
| ITF Tunisia F2 | 01/14 08:00 | 62 | Mohamed Anouar Braham v Nicolas Alvarez Varona | 3-6,2-6 | |
| Others | 11/07 09:00 | 62 | Adria S Barrera v Nicolas Alvarez Varona | 6-3,2-6,6-4 | |
| ITF Spain F38 | 11/06 11:30 | 62 | Luis G Monio v Nicolas Alvarez Varona | 6-3,0-6,2-6 | |
| ITF Spain F31 | 09/20 08:00 | 25 | Nicolas Alvarez Varona v Raul Brancaccio | Retired | |
| ITF Spain F31 Qual | 09/19 08:00 | 62 | Nicolas A Varona v Bruno Mardones | 6-4,6-1 | |
| ITF Spain F31 Qual | 09/18 07:30 | 62 | Sergio Martos Gornes v Nicolas Alvarez Varona | 4-6,7-6,5-7 | |
| ITF Spain F30 | 09/11 12:00 | 62 | Nicolas Alvarez Varona v Sergi Perez Contri | 6-7,4-6 | |
| ITF Spain F29 | 09/07 11:20 | 26 | Nicolas Alvarez Varona v Javier Marti | 1-6,1-6 | |
| ITF Spain F29 | 09/05 10:15 | 25 | Ricardo Villacorta-Alonso v Nicolas Alvarez Varona | 3-6,6-7 | |
| ITF Spain F28 | 08/30 12:45 | 25 | Pedro Martinez v Nicolas Alvarez Varona | 6-0,6-2 | |
| ITF Spain F24 | 08/03 15:00 | 25 | Nicolas Alvarez Varona v Dennis Uspensky | 3-6,6-7 | |
| Challenger Segovia Qual | 07/23 15:00 | 45 | Jaume Pla Malfeito v Nicolas Alvarez Varona | 6-3,6-4 | |
| ITF Portugal F9 | 07/19 14:00 | 25 | Hans Hach Verdugo v Nicolas Alvarez Varona | 6-3,6-4 | |
| ITF Portugal F8 Qual | 07/11 09:00 | 62 | Goncalo Falcao v Nicolas Alvarez Varona | 7-5,6-0 | |
| ITF Portugal F8 Qual | 07/10 10:00 | 62 | Jose Dominguez Alonso v Nicolas Alvarez Varona | 4-6,6-7 | |
| ITF Spain F11 | 04/24 07:30 | 44 | Pablo Vivero Gonzalez v Nicolas Alvarez Varona | 6-3,7-6 | |
| ITF Spain F10 | 04/18 12:15 | 25 | Nicolas Alvarez Varona v Roberto Ortega-Olmedo | 0-6,4-6 | |
| ITF Spain F9 Qual | 04/08 07:00 | 60 | Andrey Chepelev v Nicolas Alvarez Varona | 2-6,7-5,7-5 | |
| ITF Spain F8 | 04/03 12:30 | 62 | Samuel Ribeiro Navarrete v Nicolas Alvarez Varona | 6-1,6-3 | |
| ITF Spain F8 | 04/02 12:30 | 62 | Rafael Mazon-Hernandez v Nicolas Alvarez Varona | 3-6,1-6 | |
| ITF Spain F7 | 03/26 10:00 | 62 | Nicolas Alvarez Varona v Vincent Jaensch-Mueller | 6-7,4-6 | |
| ITF Portugal F3 Qual | 03/06 11:00 | 60 | Nicolas Alvarez Varona v Marc-Andrea Huesler | 4-6,2-6 | |
| ITF Portugal F2 | 03/01 12:05 | 25 | Nicolas Alvarez Varona v Oscar Otte | 0-6,1-6 | |
| ITF Portugal F1 | 02/20 13:30 | 60 | Nicolas Alvarez Varona v Owen Kirk | 4-6,4-6 | |
| ITF Israel F17 | 11/28 10:30 | 62 | Nicolas Alvarez Varona v Philip Sikman | 3-6,4-6 | |
| ITF Israel F16 | 11/22 10:00 | 62 | Nicolas Alvarez Varona v Philip Sikman | 7-6,3-6,5-7 | |
| ITF Spain F29 Qual | 09/12 14:00 | 62 | Nicolas Alvarez Varona v Sergio Barranco | Retired |
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.