| ITF M15 Madrid | 04/16 12:00 | 25 | Nicolas Alvarez Varona v Lipovsek Puches, Tomas | 6-3,5-7,6-7 | |
| ITF M15 Reus | 04/09 14:45 | 25 | Nicolas Alvarez Varona v Maxime Chazal | 7-5,3-6,6-7 | |
| Alicante, Spain | 04/01 12:00 | 166 | Denis Yevseyev v Nicolas Alvarez Varona | 7-6,6-1 | |
| ITF Spain F28 | 09/18 08:00 | 25 | Fornell-Mestres, Marc v Nicolas Alvarez Varona | 7-5,3-6,6-2 | |
| ITF Portugal F16 | 08/25 10:30 | 28 | Nicolas Alvarez Varona v Cacao, Tiago | 2-6,7-6,3-6 | |
| ITF Portugal F16 | 08/24 09:00 | 27 | Cornut-Chauvinc, Antoine v Nicolas Alvarez Varona | 7-5,4-6,3-6 | |
| ITF Portugal F16 | 08/23 09:00 | 26 | Finn Bass v Nicolas Alvarez Varona | Retired | |
| ITF Portugal F16 | 08/22 09:00 | 25 | Nicolas Alvarez Varona v Kern, Robin | 6-2,6-2 | |
| ITF Portugal F16 | 08/20 09:00 | 62 | Nicolas Alvarez Varona v Eduardo Ribeiro | 6-3,7-5 | |
| ITF Portugal F16 | 08/19 11:30 | 62 | Nicolas Alvarez Varona v Morais, Eduardo | 6-1,6-1 | |
| ITF Portugal F16 | 08/18 08:30 | 62 | Nicolas Alvarez Varona v Stoliar, Illia | 6-1,6-1 | |
| Challenger Segovia Qual | 07/30 10:30 | 54 | Jankovits, Yannick v Nicolas Alvarez Varona | 7-6,6-1 | |
| Challenger Segovia Qual | 07/29 09:00 | 46 | Nicolas Alvarez Varona v Viktor Durasovic | 6-3,7-6 | |
| Challenger Segovia Qual | 07/28 11:00 | 45 | Hidalgo, Diego v Nicolas Alvarez Varona | 3-6,4-6 | |
| ITF Spain F12 | 05/24 09:00 | 26 | Nicolas Alvarez Varona v Martos Gornes, Sergio | 4-6,6-7 | |
| ITF Spain F12 | 05/23 10:40 | 25 | Nicolas Alvarez Varona v Mas de Ugarte, Jordi | 6-2,6-2 | |
| ATP Madrid Qual | 05/05 16:35 | 45 | Nicolas Alvarez Varona v Mirza Basic | 6-3,6-7,2-6 | |
| ITF Spain F9 | 04/19 09:00 | 26 | Heras, Patricio v Alvarez Varona, Nicolas | 6-7,6-3,6-2 | |
| ITF Spain F9 | 04/18 13:40 | 25 | Jordan Correia Passos Do Carmo v Alvarez Varona, Nicolas | 5-7,5-7 | |
| ITF Spain F9 Qual | 04/16 11:10 | 62 | Nicolas Alvarez Varona v Moreno, Federico | 7-5,7-6 | |
| ITF Spain F9 Qual | 04/15 10:30 | 62 | Oleg Prihodko v Nicolas Alvarez Varona | 2-6,2-6 | |
| ITF Spain F9 Qual | 04/14 12:15 | 62 | Nicolas Alvarez Varona v Exposito, Adrian | 6-1,6-0 | |
| ITF Tunisia F1 | 01/11 11:15 | 26 | Nagy, Peter v Nicolas Alvarez Varona | Retired | |
| ITF Tunisia F1 | 01/09 12:15 | 25 | Ocleppo, Julian v Nicolas Alvarez Varona | 5-7,6-7 | |
| Segovia, Spain | 07/31 12:00 | 25 | Nicolas Alvarez Varona v Benjamin Bonzi | 0-6,2-6 | |
| ITF Portugal F13 | 07/26 15:30 | 25 | Adil Kalyanpur v Nicolas Alvarez Varona | Cancelled | |
| ITF Portugal F12 | 07/22 09:30 | 28 | Alvarez Varona, Nicolas v Perez Sanz, David | 6-7,7-5,5-7 | |
| ITF Portugal F12 | 07/21 11:00 | 27 | Alvarez Varona, Nicolas v Gray, Jonathan | 7-6,6-3 | |
| ITF Portugal F12 | 07/20 16:20 | 26 | Mardones, Bruno v Alvarez Varona, Nicolas | 4-6,6-4,0-6 | |
| ITF Portugal F12 | 07/19 11:55 | 25 | Adil Kalyanpur v Alvarez Varona, Nicolas | 1-6,2-6 |
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.