| Challenger - Mauthausen | 05/01 08:00 | 14 | [286] Nikolas S Izquierdo v Maximilian Neuchrist [331] | 7-6,6-1 | |
| ATP - Barcelona | 04/16 12:05 | 45 | [279] Nikolas S Izquierdo v Hugo Grenier [158] | 2-6,2-6 | |
| Challenger - Oeiras | 03/27 14:25 | 14 | [267] Nikolas S Izquierdo v Kai Wehnelt [346] | Retired | |
| Challenger - Roseto | 03/12 10:00 | 28 | [105] Carlos Taberner v Nikolas S Izquierdo [300] | 6-4,7-5 | |
| Challenger - Roseto | 03/11 10:00 | 27 | [300] Nikolas S Izquierdo v Lukas Rosol [288] | 6-4,6-2 | |
| Challenger - Roseto | 03/10 10:00 | 26 | [118] Bernabe Zapata Miralles v Nikolas S Izquierdo [300] | 5-7,6-0,3-6 | |
| Challenger - Roseto | 03/08 12:50 | 25 | Nikolas S Izquierdo v Francesco Maestrelli | 7-5,1-6,6-2 | |
| Challenger - Roseto | 03/07 10:00 | 19 | [300] Nikolas S Izquierdo v Elmar Ejupovic [423] | 6-1,6-4 | |
| Challenger - Roseto | 03/06 09:00 | 14 | [299] Nikolas S Izquierdo v Jeevan Nedunchezhiyan [184] | 7-6,6-0 | |
| Challenger - Gran Canaria | 03/03 10:30 | 26 | [264] Duje Ajdukovic v Nikolas S Izquierdo [299] | 7-5,6-1 | |
| Challenger - Gran Canaria | 03/01 10:00 | 25 | [299] Nikolas S Izquierdo v Lorenzo Giustino [208] | 6-2,6-2 | |
| Challenger - Pau | 02/20 20:05 | 14 | Nikolas S Izquierdo v Arthur Fils | 4-6,7-6,1-6 | |
| Challenger - Forlì | 02/13 12:00 | 14 | [266] Alexander Ritschard v Nikolas S Izquierdo [310] | 6-3,7-6 | |
| ITF - M15 Villena | 02/06 09:45 | 29 | Nikolas S Izquierdo v Alejandro Moro Canas | 7-6,6-3 | |
| ITF - M15 Villena | 02/05 09:30 | 28 | [310] Nikolas S Izquierdo v Johannes Haerteis [423] | 6-3,4-6,6-2 | |
| ITF - M15 Villena | 02/04 09:30 | 27 | Nikolas S Izquierdo v Maxime Chazal | 7-6,6-2 | |
| ITF - M15 Villena | 02/03 11:55 | 26 | Nikolas S Izquierdo v Miguel Damas | 0-6,6-2,7-5 | |
| ITF - M15 Villena | 02/02 15:00 | 25 | Nikolas S Izquierdo v Buvaysar Gadamauri | 6-2,7-6 | |
| Challenger - Maia | 12/17 12:55 | 27 | [210] Nuno Borges v Nikolas S Izquierdo [316] | 6-4,6-4 | |
| Challenger - Maia | 12/16 14:20 | 26 | [316] Nikolas S Izquierdo v Gastao Elias [219] | 6-1,6-7,6-3 | |
| Challenger - Maia | 12/13 14:30 | 25 | [293] Javier Barranco Cosano v Nikolas S Izquierdo [316] | 4-6,6-4,4-6 | |
| Challenger - Maia | 12/08 11:00 | 25 | [283] Geoffrey Blancaneaux v Nikolas S Izquierdo [314] | 6-3,3-6,6-2 | |
| Challenger - Antalya | 11/30 12:30 | 25 | [317] Nikolas S Izquierdo v Oliver Crawford [368] | 1-6,3-6 | |
| Challenger - Bari | 11/23 11:30 | 25 | [315] Nikolas S Izquierdo v Flavio Cobolli [214] | 6-3,2-6,0-6 | |
| Challenger - Pau | 11/15 10:00 | 19 | [311] Nikolas S Izquierdo v Georgii Kravchenko [397] | 1-6,2-6 | |
| Challenger - Pau | 11/14 11:15 | 26 | [310] Nikolas S Izquierdo v Piotr Matuszewski [295] | 6-2,6-1 | |
| Challenger - Buenos Aires | 10/19 15:40 | 25 | [276] Juan P Ficovich v Nikolas S Izquierdo [312] | 7-6,7-6 | |
| Challenger - Barcelona | 10/05 13:35 | 25 | [313] Nikolas S Izquierdo v Teymuraz Gabashvili [271] | 5-7,2-6 | |
| Challenger - Murcia | 09/28 10:50 | 25 | [313] Nikolas S Izquierdo v Tallon Griekspoor [131] | 3-6,1-6 | |
| Challenger - Braga | 09/25 13:30 | 28 | [148] Nikola Milojevic v Nikolas S Izquierdo [350] | 6-2,6-4 |
Nikolás Sánchez Izquierdo (born 17 March 1999) is a Spanish tennis player.
Sánchez Izquierdo has a career high ATP singles ranking of 238 achieved on 19 September 2022 and a career high ATP doubles ranking of 562 achieved on 29 November 2021.