| Challenger - Aix en Provence | 06/14 10:05 | 19 | [363] Nikolas S Izquierdo v Michael Geerts [351] | 6-7,6-4,6-2 | |
| Challenger - Aix en Provence | 06/13 11:15 | 14 | [355] Nikolas S Izquierdo v Rafael Matos [89] | 6-2,6-2 | |
| Challenger - Lyon | 06/06 09:30 | 14 | [427] Eduard Esteve Lobato v Nikolas S Izquierdo [355] | 6-4,6-0 | |
| Challenger - Oeiras | 05/28 11:55 | 27 | [441] Timofey Skatov v Nikolas S Izquierdo [363] | 7-6,5-7,6-1 | |
| Challenger - Oeiras | 05/26 11:25 | 26 | [363] Nikolas S Izquierdo v Tung-Lin Wu [267] | 6-2,7-6 | |
| Challenger - Oeiras | 05/25 11:40 | 25 | [318] Geoffrey Blancaneaux v Nikolas S Izquierdo [363] | 3-6,2-6 | |
| Challenger - Oeiras | 05/24 10:00 | 19 | [347] Lucas Catarina v Nikolas S Izquierdo [363] | 4-6,2-6 | |
| Challenger - Oeiras | 05/23 12:40 | 14 | Miguel Gomes v Nikolas S Izquierdo | 1-6,4-6 | |
| ITF M25 - Vic | 05/19 10:20 | 25 | [362] Nikolas S Izquierdo v Benjamin Winter Lopez [451] | 3-6,3-6 | |
| ITF M25 - Prag | 05/11 09:30 | 25 | [363] Nikolas S Izquierdo v Jesper De Jong [324] | 4-6,6-2,6-7 | |
| ITF M25 - Angers | 04/21 15:05 | 25 | [410] Sebastian Fanselow v Nikolas S Izquierdo [343] | 6-2,7-5 | |
| ITF M25 - Reus | 04/15 10:05 | 26 | Titouan Droguet v Nikolas S Izquierdo | 6-4,6-3 | |
| ITF M25 - Reus | 04/13 10:45 | 25 | [484] Kyrian Jacquet v Nikolas S Izquierdo [344] | 4-6,4-6 | |
| Challenger - Marbella | 03/30 14:45 | 25 | [126] Damir Dzumhur v Nikolas S Izquierdo [353] | 6-4,6-4 | |
| Challenger - Marbella | 03/29 09:00 | 19 | [353] Nikolas S Izquierdo v Timofey Skatov [438] | 4-6,7-6,6-3 | |
| Challenger - Marbella | 03/28 10:00 | 14 | Nikolas S Izquierdo v Angel G Melgar | 6-1,6-0 | |
| Challenger - Zadar | 03/25 09:30 | 26 | [102] Gianluca Mager v Nikolas S Izquierdo [353] | 1-6,6-4,6-1 | |
| Challenger - Zadar | 03/23 09:00 | 25 | [353] Nikolas S Izquierdo v Matija Pecotic [343] | 3-6,6-3,6-2 | |
| Challenger - Zadar | 03/22 11:15 | 19 | [353] Nikolas S Izquierdo v Skander Mansouri [373] | 6-2,6-1 | |
| Challenger - Zadar | 03/21 13:35 | 14 | Nikolas S Izquierdo v Flavio Cobolli | 6-2,7-6 | |
| ITF M15 - La Nucia | 03/14 11:00 | 29 | Emilio Nava v Nikolas S Izquierdo | 7-6,7-5 | |
| ITF M15 - La Nucia | 03/13 10:00 | 28 | Nikolas S Izquierdo v Pablo Llamas Ruiz | 6-4,6-1 | |
| ITF M15 - La Nucia | 03/12 09:25 | 27 | Georgii Kravchenko v Nikolas S Izquierdo | 4-6,1-6 | |
| ITF M15 - La Nucia | 03/11 13:00 | 26 | Nathan Seateun v Nikolas S Izquierdo | 2-6,1-6 | |
| ITF M15 - La Nucia | 03/10 13:15 | 25 | Giovanni M Perricard v Nikolas S Izquierdo | 4-6,6-4,3-6 | |
| Challenger - Gran Canaria | 03/03 13:00 | 26 | [163] Alessandro Giannessi v Nikolas S Izquierdo [363] | 7-6,7-5 | |
| Challenger - Gran Canaria | 03/01 15:30 | 25 | [363] Nikolas S Izquierdo v Andrea Pellegrino [282] | 5-7,7-5,6-3 | |
| Challenger - Gran Canaria | 02/22 10:00 | 19 | [308] Alex Molcan v Nikolas S Izquierdo [361] | 7-6,6-3 | |
| Challenger - Gran Canaria | 02/21 10:00 | 14 | Tomas Q Perez v Nikolas S Izquierdo | 1-6,1-6 | |
| Challenger - Cherbourg | 02/07 14:20 | 14 | [356] Nikolas S Izquierdo v Sander Arends [83] | 6-0,2-6,5-7 |
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.