Stadium: Court 1 Round: 25 Ground: Clay
| Challenger Zadar | 2021/03/22 11:15 | Nikolas Sanchez Izquierdo v Skander Mansouri | 6-2,6-1 |
| Challenger Zadar | 2021/03/21 13:35 | Nikolas Sanchez Izquierdo v Flavio Cobolli | 6-2,7-6 |
| ITF M15 La Nucia | 2021/03/14 11:00 | Emilio Nava v Nikolas Sanchez Izquierdo | 7-6,7-5 |
| ITF M15 La Nucia | 2021/03/13 10:00 | Nikolas Sanchez Izquierdo v Pablo Llamas Ruiz | 6-4,6-1 |
| ITF M15 La Nucia | 2021/03/12 09:25 | Georgii Kravchenko v Nikolas Sanchez Izquierdo | 4-6,1-6 |
| ITF M15 La Nucia | 2021/03/11 13:00 | Nathan Seateun v Nikolas Sanchez Izquierdo | 2-6,1-6 |
| ITF M15 La Nucia | 2021/03/10 13:15 | Giovanni Mpetshi Perricard v Nikolas Sanchez Izquierdo | 4-6,6-4,3-6 |
| Challenger Gran Canaria | 2021/03/03 13:00 | Alessandro Giannessi v Nikolas Sanchez Izquierdo | 7-6,7-5 |
| Challenger Biella Qual | 2021/03/14 13:35 | Daniel Masur v Matija Pecotic | 6-0,6-3 |
| Challenger St. Petersburg | 2021/03/09 08:20 | Jiri Lehecka v Matija Pecotic | 6-2,7-6 |
| Challenger St. Petersburg | 2021/03/08 07:00 | Alessandro Bega v Matija Pecotic | 3-6,3-6 |
| Challenger St. Petersburg Qual | 2021/03/07 07:00 | Matija Pecotic v Uladzimir Ignatik | 0-6,7-6,6-4 |
| Challenger St. Petersburg | 2021/03/02 10:30 | Matija Pecotic v Andrey Kuznetsov | 6-7,2-6 |
| ITF M25 Naples | 2021/02/25 17:10 | Alejandro Gonzalez v Matija Pecotic | 6-1,7-5 |
| ITF M25 Naples | 2021/02/24 21:15 | Alejandro Gomez v Matija Pecotic | 6-7,1-6 |
| UTR Pro Tennis Series Florida | 2021/01/23 17:00 | Matija Pecotic v Strong Kirchheimer | 5-7,2-5 |