| Challenger Tenerife - Clasificación | 02/06 10:00 | 14 | [262] Nicolas Alvarez Varona v Oscar Jose Gutierrez [445] | 3-6,3-6 | |
| Challenger de Tenerife | 02/04 13:00 | 28 | [290] Nicolas Alvarez Varona v Matteo Arnaldi [130] | 3-6,4-6 | |
| Challenger de Tenerife | 02/03 11:00 | 27 | [290] Nicolas Alvarez Varona v Alejandro Moro Canas [312] | 1-6,6-2,6-3 | |
| Challenger de Tenerife | 02/01 18:20 | 26 | [154] Ryan Peniston v Nicolas Alvarez Varona [290] | 7-5,2-6,1-6 | |
| Challenger de Tenerife | 01/30 15:00 | 25 | [290] Nicolas Alvarez Varona v Salvatore Caruso [388] | 6-3,7-5 | |
| Challenger de Maia | 11/29 11:00 | 25 | [238] Nicolas Alvarez Varona v Riccardo Bonadio [194] | 4-6,6-2,6-7 | |
| Challenger de Valencia | 11/22 12:20 | 25 | Nicolas Alvarez Varona v Pablo Llamas Ruiz | 4-6,3-6 | |
| Challenger de Champaign | 11/18 23:00 | 27 | [227] Nicolas Alvarez Varona v Aleksandar Vukic [141] | 6-7,4-6 | |
| Challenger de Champaign | 11/17 17:00 | 26 | Nicolas Alvarez Varona v August Holmgren | 6-4,7-6 | |
| Challenger de Champaign | 11/15 16:00 | 25 | [104] Denis Kudla v Nicolas Alvarez Varona [227] | 6-7,6-7 | |
| Challenger de Knoxville | 11/08 22:55 | 25 | [120] Christopher Eubanks v Nicolas Alvarez Varona [225] | 6-4,6-2 | |
| Challenger de Charlottesville | 10/31 22:45 | 25 | [135] Christopher Eubanks v Nicolas Alvarez Varona [221] | 6-1,7-6 | |
| ATP Amberes | 10/17 12:00 | 19 | [136] Dominic Stephan Stricker v Nicolas Alvarez Varona [219] | Retired | |
| ATP Amberes | 10/16 12:45 | 14 | [283] Louis Wessels v Nicolas Alvarez Varona [231] | 4-6,4-6 | |
| ATP Gijón | 10/12 11:40 | 26 | [231] Nicolas Alvarez Varona v Tommy Paul [30] | 3-6,6-7 | |
| ATP Gijón | 10/11 11:00 | 25 | [241] Marco Trungelliti v Nicolas Alvarez Varona [231] | 6-1,3-6,0-6 | |
| ATP Gijón | 10/09 15:05 | 19 | [277] Lorenzo Giustino v Nicolas Alvarez Varona [228] | 2-6,2-6 | |
| ATP Gijón | 10/08 16:50 | 14 | [309] Oriol Roca Batalla v Nicolas Alvarez Varona [228] | 6-4,3-6,2-6 | |
| Challenger de Alicante | 10/06 15:05 | 26 | [228] Nicolas Alvarez Varona v Nick Hardt [255] | 6-7,4-6 | |
| Challenger de Alicante | 10/03 13:45 | 25 | [228] Nicolas Alvarez Varona v Gabriel Decamps [264] | 6-2,7-5 | |
| ATP Tel Aviv | 09/26 09:00 | 19 | [140] Liam Broady v Nicolas Alvarez Varona [225] | 7-6,6-1 | |
| ATP Tel Aviv | 09/25 07:00 | 14 | [449] Daniel Cukierman v Nicolas Alvarez Varona [225] | 2-6,6-2,3-6 | |
| Challenger de Estambul | 09/14 08:25 | 26 | [234] Nicolas Alvarez Varona v Beibit Zhukayev [357] | 4-6,1-6 | |
| Challenger de Estambul | 09/12 13:00 | 25 | [220] Nicolas Alvarez Varona v Aldin Setkic [363] | 6-1,6-4 | |
| Challenger de Sevilla | 09/05 19:00 | 25 | [220] Nicolas Alvarez Varona v Riccardo Bonadio [188] | 2-6,6-7 | |
| Challenger de Mallorca | 08/30 11:00 | 25 | [194] Antoine Bellier v Nicolas Alvarez Varona [220] | 3-6,6-3,6-1 | |
| Challenger de Banja Luka | 08/25 16:30 | 26 | [224] Nicolas Alvarez Varona v Kimmer Coppejans [312] | 4-6,3-6 | |
| Challenger de Banja Luka | 08/23 09:00 | 25 | [224] Nicolas Alvarez Varona v Hernan Casanova [327] | 6-1,6-7,6-3 | |
| Challenger de Grodzisk Mazowiecki | 08/16 11:15 | 25 | Nicolas Alvarez Varona v Maks Kasnikowski | 5-7,3-6 | |
| Challenger de Liberec | 08/07 10:00 | 29 | [65] Jiri Lehecka v Nicolas Alvarez Varona [269] | 6-4,6-4 |
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.