| Challenge - Sevilha | 09/05 18:00 | 25 | [257] Nikolas S Izquierdo v Gian Marco Moroni [238] | 4-6,6-2,6-4 | |
| Challenger - Toulouse | 08/31 08:30 | 26 | [257] Nikolas S Izquierdo v Titouan Droguet [465] | 4-6,6-7 | |
| Challenger - Toulouse | 08/29 16:05 | 25 | [324] Duje Ajdukovic v Nikolas S Izquierdo [257] | 2-6,6-4,0-6 | |
| Challenger - Banja Luka | 08/24 11:05 | 26 | Dragos Nicolae Madaras v Nikolas Sanchez Izquierdo | 7-6,2-6,6-4 | |
| Challenger - Banja Luka | 08/23 11:30 | 25 | [364] Aldin Setkic v Nikolas S Izquierdo [245] | 4-6,6-1,3-6 | |
| Challenger - San Marino | 08/12 15:00 | 27 | [329] Filip C Jianu v Nikolas S Izquierdo [252] | 6-2,6-4 | |
| Challenger - San Marino | 08/10 13:00 | 26 | [258] Robin Haase v Nikolas S Izquierdo [252] | 6-2,1-6,3-6 | |
| Challenger - San Marino | 08/09 12:10 | 25 | [252] Nikolas S Izquierdo v Alexandre Muller [145] | 3-6,6-3,6-0 | |
| Challenger - Cordenons | 08/03 12:50 | 25 | [278] Ernests Gulbis v Nikolas S Izquierdo [250] | 7-6,6-4 | |
| Challenger - San Benedetto | 07/26 11:00 | 25 | Gianmarco Ferrari v Nikolas S Izquierdo | 7-6,7-6 | |
| Challenger Iasi | 07/14 10:00 | 26 | [258] Nikolas S Izquierdo v Felipe Meligeni Rodrigues Alves [169] | 2-6,4-6 | |
| Challenger Iasi | 07/12 07:30 | 25 | [258] Nikolas S Izquierdo v Matteo Arnaldi [220] | 6-2,6-3 | |
| Challenger - Troyes | 07/01 13:00 | 27 | [271] Nikolas S Izquierdo v Raul Brancaccio [323] | 0-6,2-6 | |
| Challenger - Troyes | 06/29 12:50 | 26 | [226] Timofey Skatov v Nikolas S Izquierdo [271] | 0-6,2-6 | |
| Challenger - Troyes | 06/28 11:10 | 25 | [362] Adrian Andreev v Nikolas S Izquierdo [271] | 4-6,6-0,2-6 | |
| Challenger - Oeiras | 06/23 10:30 | 26 | [279] Nikolas S Izquierdo v Facundo Bagnis [110] | 4-6,2-6 | |
| Challenger - Oeiras | 06/21 12:35 | 25 | [380] Alexandar Lazarov v Nikolas S Izquierdo [279] | 6-2,2-6,4-6 | |
| Challenger - Blois | 06/17 12:00 | 27 | [298] Nikolas S Izquierdo v Luca Van Assche [383] | 4-6,6-7 | |
| Challenger - Blois | 06/16 09:30 | 26 | [174] Nino Serdarusic v Nikolas S Izquierdo [298] | 3-6,2-6 | |
| Challenger - Blois | 06/14 10:55 | 25 | [215] Cedrik-Marcel Stebe v Nikolas S Izquierdo [298] | 2-6,3-6 | |
| Challenger - Blois | 06/13 09:00 | 19 | [254] Thiago Seyboth Wild v Nikolas S Izquierdo [298] | 6-2,1-6,5-7 | |
| Challenger - Blois | 06/12 08:30 | 14 | [408] Sergey Fomin v Nikolas S Izquierdo [298] | 7-5,2-6,4-6 | |
| ITF - M25 Mataró | 05/25 12:15 | 25 | [487] Alvaro Lopez San Martin v Nikolas S Izquierdo [286] | 4-6,6-4,6-4 | |
| Challenger - Túnis | 05/18 11:45 | 26 | [266] Zhizhen Zhang v Nikolas S Izquierdo [289] | 6-3,7-5 | |
| Challenger - Túnis | 05/16 15:55 | 25 | [289] Nikolas S Izquierdo v Alexey Vatutin [326] | 6-3,2-6,7-5 | |
| Challenger - Heilbronn | 05/09 09:30 | 19 | [287] Nikolas S Izquierdo v Oleksii Krutykh [314] | 4-6,4-6 | |
| Challenger - Heilbronn | 05/08 09:30 | 14 | Nikolas S Izquierdo v Liam Gavrielides | 7-6,6-3 | |
| Challenger - Mauthausen | 05/03 10:20 | 25 | [85] John Millman v Nikolas S Izquierdo [297] | 6-3,4-6,6-2 | |
| Challenger - Mauthausen | 05/02 08:00 | 19 | [297] Nikolas S Izquierdo v Mats Rosenkranz [344] | 7-6,6-4 | |
| Challenger - Mauthausen | 05/01 08:00 | 14 | [286] Nikolas S Izquierdo v Maximilian Neuchrist [331] | 7-6,6-1 |
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.