| Challenger - Blois | 06/23 15:30 | 28 | [395] Kyrian Jacquet v Nikolas S Izquierdo [297] | 6-3,6-3 | |
| Challenger - Blois | 06/23 10:00 | 27 | [422] Kenny de Schepper v Nikolas S Izquierdo [297] | 6-3,3-6,6-7 | |
| Challenger - Blois | 06/21 10:50 | 26 | [297] Nikolas S Izquierdo v Pedro Martinez [121] | 6-4,6-3 | |
| Challenger - Blois | 06/20 12:20 | 25 | [281] Elmar Ejupovic v Nikolas S Izquierdo [297] | 7-6,4-6,1-6 | |
| Challenger - Blois | 06/19 11:45 | 19 | [297] Nikolas S Izquierdo v Conner Huertas Del Pino [202] | 7-6,6-4 | |
| Challenger - Blois | 06/18 14:25 | 14 | [280] Nikolas S Izquierdo v Jakub Paul [191] | 7-6,3-6,6-1 | |
| Challenger - Lyon | 06/11 11:55 | 45 | Nikolas S Izquierdo v Tom Paris | 5-7,2-6 | |
| ITF M25 - Mataro | 05/28 08:20 | 29 | Stefanos Sakellaridis v Nikolas S Izquierdo | 1-6,4-6 | |
| ITF M25 - Mataro | 05/27 09:00 | 28 | Kyle Kang v Nikolas S Izquierdo | 7-6,2-6,2-6 | |
| ITF M25 - Mataro | 05/26 12:45 | 27 | Daniel Vallejo v Nikolas S Izquierdo | 1-6,1-6 | |
| ITF M25 - Mataro | 05/25 11:00 | 26 | [282] Fajing Sun v Nikolas S Izquierdo [304] | 2-6,3-6 | |
| ITF M25 - Mataro | 05/23 14:55 | 25 | Zach Stephens v Nikolas S Izquierdo | 1-6,1-6 | |
| ITF M25 - Gurb | 05/18 09:00 | 26 | David Jorda Sanchis v Nikolas S Izquierdo | 6-4,6-2 | |
| ITF M25 - Gurb | 05/17 09:30 | 25 | Kyle Kang v Nikolas S Izquierdo | 4-6,3-6 | |
| ITF M25 - Valldoreix | 05/14 09:00 | 29 | [377] Alex M Pujolras v Nikolas S Izquierdo [339] | 2-6,0-6 | |
| ITF M25 - Valldoreix | 05/13 09:00 | 28 | [339] Nikolas S Izquierdo v Calvin Hemery [349] | 6-4,6-1 | |
| ITF M25 - Valldoreix | 05/12 08:00 | 27 | Tristan Lamasine v Nikolas S Izquierdo | 6-3,1-6,2-6 | |
| ITF M25 - Valldoreix | 05/11 11:20 | 26 | [481] Rimpei Kawakami v Nikolas S Izquierdo [339] | 2-6,4-6 | |
| ITF M25 - Valldoreix | 05/09 11:35 | 25 | Eduardo Pobes v Nikolas S Izquierdo | 1-6,0-6 | |
| ITF M25 - Sabadell | 05/04 11:35 | 26 | [332] Nikolas S Izquierdo v Mathias Bourgue [382] | 7-6,5-7,1-6 | |
| ITF M25 - Sabadell | 05/03 10:00 | 25 | [332] Nikolas S Izquierdo v Georgii Kravchenko [393] | 7-6,7-5 | |
| ITF M25 - Santa Margherita | 04/27 10:35 | 27 | [444] Giovanni Oradini v Nikolas S Izquierdo [332] | 6-4,0-6,6-1 | |
| ITF M25 - Santa Margherita | 04/26 07:55 | 26 | Lorenzo Carboni v Nikolas S Izquierdo | 3-6,3-6 | |
| ITF M25 - Santa Margherita | 04/24 11:35 | 25 | Niccolo Ciavarella v Nikolas S Izquierdo | 0-6,7-6,1-6 | |
| Challenger - Oeiras | 04/16 11:00 | 14 | Nikolas S Izquierdo v Sandro Kopp | Cancelled | |
| Challenger - Madrid | 04/11 08:45 | 25 | Miguel Damas v Nikolas S Izquierdo | 6-4,6-4 | |
| Challenger - Madrid | 04/10 09:00 | 19 | [349] Javier Barranco Cosano v Nikolas S Izquierdo [336] | 6-3,6-7,2-6 | |
| Challenger - Madrid | 04/09 14:55 | 14 | Rafael Jodar v Nikolas S Izquierdo | 1-6,0-6 | |
| ITF M25 - Reus | 04/07 10:45 | 27 | Alejandro Manzanera Pertusa v Nikolas Sanchez Izquierdo | 7-5,1-6,6-1 | |
| ITF M25 - Reus | 04/06 16:25 | 26 | Sergi Perez Contri v Nikolas S Izquierdo | 2-6,7-6,4-6 |
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.