| ATP Barcelona | 04/13 11:55 | 45 | Nicolas Alvarez Varona v Hugo Grenier | 6-7,2-6 | |
| Challenger Girona | 03/26 13:00 | 25 | Marco Trungelliti v Nicolas Alvarez Varona | 7-5,1-6,7-5 | |
| Challenger Girona | 03/24 11:40 | 14 | Joao Sousa v Nicolas Alvarez Varona | Cancelled | |
| Challenger Murcia | 03/21 14:50 | 26 | Bu Yunchaokete v Nicolas Alvarez Varona | 7-6,6-3 | |
| Challenger Murcia | 03/19 14:20 | 25 | Nicolas Alvarez Varona v Stefano Napolitano | 6-0,2-6,6-4 | |
| Challenger Murcia | 03/18 10:00 | 19 | Raul Brancaccio v Nicolas Alvarez Varona | 4-6,3-6 | |
| Challenger Murcia | 03/17 12:05 | 14 | Nicolas Alvarez Varona v Carlos Lopez Montagud | 6-4,5-7,6-4 | |
| ITF M15 Antalya | 03/05 08:20 | 62 | Nicolas Alvarez Varona v Dinko Dinev | 6-7,4-6 | |
| ITF M15 Antalya | 03/04 08:35 | 62 | Nicolas Alvarez Varona v Leonardo Borrelli | 6-3,6-3 | |
| ITF M15 Antalya | 03/03 07:00 | 62 | Nicolas Alvarez Varona v Umut Kaan Yenilmez | 6-4,6-4 | |
| Challenger Oeiras | 01/09 12:20 | 25 | Nicolas Alvarez Varona v Elmer Moller | Retired | |
| Challenger Oeiras | 01/09 10:00 | 25 | Nicolas Alvarez Varona v Oscar Otte | Cancelled | |
| Challenger Oeiras | 01/02 14:20 | 25 | Nicolas Alvarez Varona v Paul Jubb | 5-7,2-6 | |
| Challenger Maspalomas | 11/28 12:25 | 25 | Nicolas Alvarez Varona v Kilian Feldbausch | Retired | |
| Challenger Valencia | 11/20 11:40 | 19 | Miguel Damas v Nicolas Alvarez Varona | 6-1,6-0 | |
| Challenger Valencia | 11/19 12:30 | 14 | Nicolas Alvarez Varona v Lorenzo Giustino | 6-4,6-4 | |
| ITF M15 Valencia | 11/16 08:20 | 26 | Carlos Gimeno Valero v Nicolas Alvarez Varona | 6-1,3-6,6-4 | |
| ITF M15 Valencia | 11/14 11:00 | 25 | Nicolas Alvarez Varona v Alex M Pujolras | 6-2,6-7,6-2 | |
| ITF M25 Benicarlo | 11/07 11:35 | 25 | Alejandro Moro Canas v Nicolas Alvarez Varona | 6-3,6-3 | |
| ITF M15 Castellon | 10/19 14:00 | 27 | Miguel Damas v Nicolas Alvarez Varona | 7-6,6-1 | |
| ITF M15 Castellon | 10/19 09:55 | 26 | Nikolay Nedelchev v Nicolas Alvarez Varona | 3-6,3-6 | |
| ITF M15 Castellon | 10/18 12:40 | 25 | Antonio Cayetano March v Nicolas Alvarez Varona | 2-6,3-6 | |
| ITF M15 Vigo | 10/13 13:15 | 27 | Nicolas Alvarez Varona v Alejo Sanchez Quilez | 1-6,6-7 | |
| ITF M15 Vigo | 10/12 14:35 | 26 | Nicolas Alvarez Varona v Tomas C Abasolo | 6-3,6-2 | |
| ITF M15 Vigo | 10/10 14:15 | 25 | Nicolas Alvarez Varona v Rafael I Luque | Retired | |
| Challenger Murcia | 04/04 15:50 | 25 | [117] Borna Gojo v Nicolas Alvarez Varona [272] | 6-3,6-2 | |
| Challenger Tenerife Qual | 02/06 10:00 | 14 | [262] Nicolas Alvarez Varona v Oscar Jose Gutierrez [445] | 3-6,3-6 | |
| Challenger Tenerife | 02/04 13:00 | 28 | [290] Nicolas Alvarez Varona v Matteo Arnaldi [130] | 3-6,4-6 | |
| Challenger Tenerife | 02/03 11:00 | 27 | [290] Nicolas Alvarez Varona v Alejandro Moro Canas [312] | 1-6,6-2,6-3 | |
| Challenger Tenerife | 02/01 18:20 | 26 | [154] Ryan Peniston v Nicolas Alvarez Varona [290] | 7-5,2-6,1-6 |
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 Max Alcalá Gurri before losing to Brandon Nakashima.