| ITF - M25 Benicarló | 11/09 10:00 | 26 | [486] Miguel Damas v Nikolas S Izquierdo [284] | 6-3,6-0 | |
| ITF - M25 Benicarló | 11/08 09:55 | 25 | Darwin Blanch v Nikolas S Izquierdo | 0-6,1-6 | |
| Challenger - Hamburgo | 10/17 13:55 | 25 | [283] Nikolas S Izquierdo v Billy Harris [262] | 4-6,2-6 | |
| ITF - M25 Santa Margherita | 10/12 10:25 | 27 | [294] Nikolas S Izquierdo v Goncalo Oliveira [244] | 4-6,7-6,6-7 | |
| ITF - M25 Santa Margherita | 10/11 09:50 | 26 | Nikolas S Izquierdo v Lorenzo Carboni | 3-6,6-4,6-2 | |
| ITF - M25 Santa Margherita | 10/10 09:00 | 25 | Nikolas S Izquierdo v Luca Potenza | 6-2,4-6,7-6 | |
| ITF - M25 Santa Margherita | 10/07 08:55 | 29 | Gabriele Piraino v Nikolas S Izquierdo | 0-6,4-6 | |
| ITF - M25 Santa Margherita | 10/06 09:00 | 28 | [488] Gianmarco Ferrari v Nikolas S Izquierdo [294] | 6-4,4-6,2-6 | |
| ITF - M25 Santa Margherita | 10/05 09:00 | 27 | [498] Federico Iannaccone v Nikolas S Izquierdo [294] | 1-6,2-6 | |
| ITF - M25 Santa Margherita | 10/04 08:00 | 26 | Tommaso Compagnucci v Nikolas S Izquierdo | 6-7,0-6 | |
| ITF - M25 Santa Margherita | 10/03 07:55 | 25 | Toby Martin v Nikolas S Izquierdo | 1-6,3-6 | |
| Challenger - Braga | 09/25 09:00 | 19 | [264] Timo Stodder v Nikolas S Izquierdo [289] | 3-6,6-4,6-1 | |
| Challenger - Braga | 09/24 09:00 | 14 | [404] Duarte Vale v Nikolas S Izquierdo [289] | 3-6,2-6 | |
| Challenger - Sibiu | 09/19 07:00 | 25 | [110] Zsombor Piros v Nikolas S Izquierdo [289] | 6-3,6-3 | |
| Challenge - Sevilha | 09/06 14:05 | 26 | [144] Pablo Llamas Ruiz v Nikolas S Izquierdo [284] | 6-7,6-4,6-4 | |
| Challenge - Sevilha | 09/05 18:20 | 25 | [352] Viktor Durasovic v Nikolas S Izquierdo [284] | 4-6,6-3,4-6 | |
| Challenger - Como | 08/29 11:40 | 25 | [284] Nikolas S Izquierdo v Lukas Neumayer [223] | 3-6,7-5,3-6 | |
| Challenger - Augsburgo | 08/22 13:30 | 25 | Marvin Moeller v Nikolas S Izquierdo | 2-6,6-2,6-0 | |
| Challenger - Banja Luka | 08/08 16:45 | 25 | [268] Nikolas S Izquierdo v Duje Ajdukovic [216] | 4-6,5-7 | |
| Challenger - San Marino | 08/02 13:40 | 26 | [269] Nikolas S Izquierdo v Jaume Munar [91] | 1-6,2-6 | |
| Challenger - San Marino | 08/01 11:00 | 25 | [355] Carlos Taberner v Nikolas S Izquierdo [269] | 6-2,2-6,5-7 | |
| Challenger - Tampere | 07/20 09:00 | 26 | [291] Nikolas S Izquierdo v Duje Ajdukovic [326] | 1-6,6-7 | |
| Challenger - Tampere | 07/18 11:10 | 25 | [236] Edoardo Lavagno v Nikolas S Izquierdo [291] | 4-6,3-6 | |
| ITF - M25 Esch/Alzette | 07/16 08:30 | 29 | Nikolas S Izquierdo v Marlon Vankan | 1-6,6-3,6-2 | |
| ITF - M25 Esch/Alzette | 07/15 09:55 | 28 | Nikolas S Izquierdo v Alexander Blockx | 4-6,7-6,6-4 | |
| ITF - M25 Esch/Alzette | 07/14 10:00 | 27 | Nikolas S Izquierdo v Marcel Zielinski | Retired | |
| ITF - M25 Esch/Alzette | 07/13 15:00 | 26 | Nikolas S Izquierdo v Martin Krumich | 6-3,7-6 | |
| ITF - M25 Esch/Alzette | 07/12 15:30 | 25 | Nikolas S Izquierdo v Gilles Kremer | 6-2,6-1 | |
| Challenger - Troyes | 07/04 08:30 | 25 | [275] Nikolas S Izquierdo v Murkel Dellien [328] | 6-7,6-0,4-6 | |
| Challenger - Blois | 06/23 15:30 | 28 | [395] Kyrian Jacquet v Nikolas S Izquierdo [297] | 6-3,6-3 |
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.