| 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 | |
| Spanyol Summer League | 07/30 16:50 | - | Nicolas Alvarez Varona v Javier Barranco Cosano | 6-4,5-7,4-6 | |
| Spanyol Summer League | 07/29 17:40 | - | Nicolas Alvarez Varona v Juan P Canas Garcia | 6-3,7-6 | |
| Spanyol Summer League | 07/24 09:30 | - | Pedro Martinez Portero v Nicolas Alvarez Varona | 6-3,3-6,5-4 | |
| Spanyol Summer League | 07/23 08:00 | - | Nicolas Alvarez Varona v Adrian Menendez-Maceiras | 6-3,6-2 | |
| Spanyol Summer League | 07/22 08:00 | - | Nicolas Alvarez Varona v Albert Roglan | 0-0 | |
| Spanyol Summer League | 07/16 15:00 | - | Nicolas Alvarez Varona v Javier Barranco Cosano | 2-4 | |
| Spanyol 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.