| ITF - M25 Sabadell | 05/01 09:30 | 25 | Nicolas Alvarez Varona v Nino Serdarusic | Retired | |
| 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 - Castellón | 10/19 14:00 | 27 | Miguel Damas v Nicolas Alvarez Varona | 7-6,6-1 | |
| ITF M15 - Castellón | 10/19 09:55 | 26 | Nikolay Nedelchev v Nicolas Alvarez Varona | 3-6,3-6 | |
| ITF M15 - Castellón | 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 - Kwal. | 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 |
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.