| Spain F4, Singles Qualifying | 02/03 12:00 | 62 | Pedro Vives Marcos v Nikolas S Izquierdo | 3-6,2-6 | |
| Tunisia F40, Singles | 12/21 08:30 | 26 | Nikolas S Izquierdo v Bortolotti, Marco | 6-4,5-7,0-6 | |
| Tunisia F40, Singles | 12/19 08:30 | 25 | Di Prima, Marco v Nikolas S Izquierdo | 1-6,3-6 | |
| Tunisia F40, Singles | 12/18 08:30 | 44 | Nikolas S Izquierdo v Cozzolino, Giovanni | 6-1,4-6,6-1 | |
| Tunisia F40, Singles | 12/17 08:00 | 44 | Nikolas S Izquierdo v Seroddi, Lorenzo | 6-3,6-1 | |
| ITF Tunisia F37 | 11/29 08:30 | 25 | Oriol Roca Batalla v Nikolas S Izquierdo | 6-4,6-4 | |
| ITF Tunisia F36 | 11/25 09:00 | 28 | Nikolas S Izquierdo v Oriol Roca Batalla | 3-6,4-6 | |
| ITF Tunisia F36 | 11/25 09:00 | 26 | Nikolas S Izquierdo v Elliot Benchetrit | Walkover | |
| ITF Tunisia F36 | 11/24 11:00 | 27 | Steven Diez v Nikolas S Izquierdo | 6-3,5-7,1-6 | |
| ITF Tunisia F36 | 11/21 11:15 | 25 | Hassan, Mohamed v Nikolas Sanchez Izquierdo | 1-6,5-7 | |
| ITF Turkey F40 | 10/23 07:15 | 62 | Felipe Meligeni Rodrigues Alves v Nikolas S Izquierdo | 5-7,6-3,7-6 | |
| ITF Turkey F40 | 10/22 07:15 | 62 | Pavel Verbin v Nikolas Sanchez Izquierdo | 2-6,0-6 | |
| ITF Turkey F40 | 10/21 06:45 | 62 | Nikolas S Izquierdo v Dimitrov, Martin | 7-5,6-1 | |
| ITF Turkey F39 | 10/15 07:00 | 62 | Nikolas S Izquierdo v Laranja, Augusto | 2-6,6-4,3-6 | |
| ITF Turkey F39 | 10/14 07:00 | 62 | Pavel Verbin v Nikolas Sanchez Izquierdo | 3-6,0-6 | |
| ITF Spain F33 | 10/10 09:10 | 25 | Andrey Chepelev v Nikolas S Izquierdo | 7-6,6-4 | |
| ITF Spain F33 | 10/09 08:00 | 62 | Sorni Chavarria, Quim v Nikolas S Izquierdo | 3-6,5-7 | |
| ITF Spain F33 | 10/08 07:00 | 62 | Nikolas Sanchez Izquierdo v Alex M Pujolras | 6-4,7-5 | |
| ITF Spain F33 | 10/07 07:00 | 62 | Nikolas S Izquierdo v Ziganshin, Robert | 6-1,6-2 | |
| ITF Turkey F37 | 09/30 12:00 | 62 | Nikolas S Izquierdo v Horton, Nicholas | 3-6,4-6 | |
| ITF Spain F31 Qual | 09/24 07:30 | 45 | Nikolas S Izquierdo v Roumane, Rayane | 6-4,2-6,4-6 | |
| ITF Spain F31 Qual | 09/23 09:30 | 44 | Nikolas Sanchez Izquierdo v Rodriguez Queralto, Arnau | 6-0,6-1 | |
| ITF Spain F30 Qual | 09/17 13:30 | 62 | Pedro Martinez v Nikolas S Izquierdo | 6-4,6-3 | |
| ITF Spain F27 | 08/29 17:00 | 25 | Nikolas S Izquierdo v Gimeno-Traver, Daniel | 0-6,4-6 | |
| ITF Spain F27 Qual | 08/27 11:15 | 54 | Vallejo, Miguel v Nikolas S Izquierdo | 6-7,2-6 | |
| ITF Spain F14 | 05/13 07:00 | 62 | Nikolas Sanchez Izquierdo v Sorni Chavarria, Quim | 4-6,5-7 | |
| ITF Spain F13 | 05/06 11:30 | 62 | Nikolas S Izquierdo v Vuradin, Lucas | 3-6,4-6 | |
| ITF Spain F8 | 03/18 09:45 | 60 | Nikolas S Izquierdo v Boris Pokotilov | 6-7,6-2,4-6 | |
| ITF Spain F7 | 03/12 08:30 | 62 | Nikolas Sanchez Izquierdo v Ibanez Gallego, Alejandro | 2-6,4-6 | |
| ITF Spain F7 | 03/11 08:30 | 62 | Nikolas Sanchez Izquierdo v Exposito, Adrian | 6-2,4-6,6-2 |
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.