| Challenger - Tenerife - Qualificação | 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 | |
| Challenger - Tenerife | 01/30 15:00 | 25 | [290] Nicolas Alvarez Varona v Salvatore Caruso [388] | 6-3,7-5 | |
| Challenger - Maia | 11/29 11:00 | 25 | [238] Nicolas Alvarez Varona v Riccardo Bonadio [194] | 4-6,6-2,6-7 | |
| Challenger - Valência | 11/22 12:20 | 25 | Nicolas Alvarez Varona v Pablo Llamas Ruiz | 4-6,3-6 | |
| Challenger - Champaign | 11/18 23:00 | 27 | [227] Nicolas Alvarez Varona v Aleksandar Vukic [141] | 6-7,4-6 | |
| Challenger - Champaign | 11/17 17:00 | 26 | Nicolas Alvarez Varona v August Holmgren | 6-4,7-6 | |
| Challenger - Champaign | 11/15 16:00 | 25 | [104] Denis Kudla v Nicolas Alvarez Varona [227] | 6-7,6-7 | |
| Challenger - Knoxville | 11/08 22:55 | 25 | [120] Christopher Eubanks v Nicolas Alvarez Varona [225] | 6-4,6-2 | |
| Challenger - Charlottesville | 10/31 22:45 | 25 | [135] Christopher Eubanks v Nicolas Alvarez Varona [221] | 6-1,7-6 | |
| ATP - Antuérpia | 10/17 12:00 | 19 | [136] Dominic Stephan Stricker v Nicolas Alvarez Varona [219] | Retired | |
| ATP - Antuérpia | 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 - Alicante | 10/06 15:05 | 26 | [228] Nicolas Alvarez Varona v Nick Hardt [255] | 6-7,4-6 | |
| Challenger - 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 - Istambul | 09/14 08:25 | 26 | [234] Nicolas Alvarez Varona v Beibit Zhukayev [357] | 4-6,1-6 | |
| Challenger - Istambul | 09/12 13:00 | 25 | [220] Nicolas Alvarez Varona v Aldin Setkic [363] | 6-1,6-4 | |
| Challenge - Sevilha | 09/05 19:00 | 25 | [220] Nicolas Alvarez Varona v Riccardo Bonadio [188] | 2-6,6-7 | |
| Challenger - Maiorca | 08/30 11:00 | 25 | [194] Antoine Bellier v Nicolas Alvarez Varona [220] | 3-6,6-3,6-1 | |
| Challenger - Banja Luka | 08/25 16:30 | 26 | [224] Nicolas Alvarez Varona v Kimmer Coppejans [312] | 4-6,3-6 | |
| Challenger - Banja Luka | 08/23 09:00 | 25 | [224] Nicolas Alvarez Varona v Hernan Casanova [327] | 6-1,6-7,6-3 | |
| Challenger - Grodzisk Mazowiecki | 08/16 11:15 | 25 | Nicolas Alvarez Varona v Maks Kasnikowski | 5-7,3-6 | |
| Challenger - 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.