| ITF - M15 Sintra | 09/10 08:30 | 26 | Roberto Ortega-Olmedo v Nicolas Alvarez Varona | 2-6,4-6 | |
| ITF - M15 Sintra | 09/09 08:30 | 25 | Nicolas Alvarez Varona v Carlos Gimeno Valero | 3-6,6-4,7-5 | |
| ITF - M15 Sintra | 09/07 13:00 | 44 | Tiago Torres v Nicolas Alvarez Varona | 7-6,1-6,4-10 | |
| ITF - M15 Sintra | 09/07 08:30 | 44 | Fabio Coelho v Nicolas Alvarez Varona | 6-2,4-6,7-10 | |
| ITF - M15 Sintra | 09/06 08:30 | 44 | Terence Das v Nicolas Alvarez Varona | 4-6,6-7 | |
| Spanish Summer League | 07/30 16:50 | - | Nicolas Alvarez Varona v Javier Barranco Cosano | 6-4,5-7,4-6 | |
| Spanish Summer League | 07/29 17:40 | - | Nicolas Alvarez Varona v Juan P Canas Garcia | 6-3,7-6 | |
| Spanish Summer League | 07/24 09:30 | - | Pedro Martinez Portero v Nicolas Alvarez Varona | 6-3,3-6,5-4 | |
| Spanish Summer League | 07/23 08:00 | - | Nicolas Alvarez Varona v Adrian Menendez-Maceiras | 6-3,6-2 | |
| Spanish Summer League | 07/22 08:00 | - | Nicolas Alvarez Varona v Albert Roglan | 0-0 | |
| Spanish Summer League | 07/16 15:00 | - | Nicolas Alvarez Varona v Javier Barranco Cosano | 2-4 | |
| Spanish Summer League | 07/15 15:00 | - | Nicolas Alvarez Varona v Alex M Pujolras | 6-4,6-2 | |
| ITF - M25 Murcia | 03/05 18:00 | 26 | Pablo Llamas Ruiz v Nicolas Alvarez Varona | 6-4,6-2 | |
| ITF - M25 Murcia | 03/04 17:30 | 25 | Nicolas Alvarez Varona v Jordan Correia | Cancelled | |
| ITF - M25 Murcia | 03/04 15:20 | 25 | Nicolas Alvarez Varona v Zakhar Trapeznikov | 7-6,6-1 | |
| ITF - M15 Monastir | 03/01 09:00 | 29 | Nicolas Alvarez Varona v Thomas Laurent | 2-6,3-6 | |
| ITF - M15 Monastir | 02/29 09:00 | 28 | Nicolas Alvarez Varona v Majed Kilani | 6-7,6-3,6-0 | |
| ITF - M15 Monastir | 02/28 11:00 | 27 | Baptiste Crepatte v Nicolas Alvarez Varona | 6-7,3-6 | |
| ITF - M15 Monastir | 02/27 12:05 | 26 | Julien Cagnina v Nicolas Alvarez Varona | 4-6,5-7 | |
| ITF - M15 Monastir | 02/26 11:50 | 25 | Vinayak Sharma Kaza v Nicolas Alvarez Varona | 6-4,6-7,1-6 | |
| ITF - M15 Monastir | 02/21 09:00 | 27 | Nicolas Alvarez Varona v Quentin Folliot | 2-6,6-7 | |
| ITF - M15 Monastir | 02/20 12:30 | 26 | Nicolas Alvarez Varona v Timo Legout | 6-2,6-7,6-2 | |
| ITF - M15 Monastir | 02/18 10:50 | 25 | Nicolas Alvarez Varona v Dan Alexandru Tomescu | 6-7,6-3,6-4 | |
| ITF - M15 Monastir | 12/06 09:00 | 27 | Evgeny Tyurnev v Nicolas Alvarez Varona | Retired | |
| ITF - M15 Monastir | 12/05 12:20 | 26 | Nicolas Alvarez Varona v Erik Crepaldi | 7-6,6-3 | |
| ITF - M15 Monastir | 12/03 09:45 | 25 | Nicolas Alvarez Varona v Alexander Igoshin | 6-4,6-1 | |
| ITF - M15 Monastir | 11/29 10:10 | 27 | Aziz Dougaz v Nicolas Alvarez Varona | 6-2,1-6,6-2 | |
| ITF - M15 Monastir | 11/28 11:55 | 26 | Nicolas Alvarez Varona v Zizou Bergs | 6-4,3-6,6-3 | |
| ITF - M15 Monastir | 11/27 12:15 | 25 | Nicolas Alvarez Varona v Mirko Martinez | 6-4,4-6,6-2 | |
| ITF - M15 Monastir | 11/23 08:30 | 28 | Arnaud Bovy v Nicolas Alvarez Varona | 6-3,6-7,6-3 |
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.