Stadium: Court 1 Round: 25 Ground: Clay
| Challenger Losinj | 2021/10/19 09:35 | Marco Cecchinato v Alvaro Lopez San Martin | 7-6,7-6 |
| Challenger Napoli | 2021/10/13 09:00 | Alvaro Lopez San Martin v Tallon Griekspoor | 3-6,3-6 |
| Challenger Napoli | 2021/10/12 11:20 | Alvaro Lopez San Martin v Timofey Skatov | 6-3,6-2 |
| Challenger Napoli | 2021/10/11 12:15 | Evan Furness v Alvaro Lopez San Martin | 4-6,0-6 |
| Challenger Napoli | 2021/10/11 08:30 | Louis Wessels v Alvaro Lopez San Martin | 6-7,4-6 |
| Challenger Barcelona | 2021/10/05 14:00 | Alvaro Lopez San Martin v Nuno Borges | 1-6,0-6 |
| Challenger Barcelona | 2021/10/04 13:00 | Alvaro Lopez San Martin v Georgii Kravchenko | 2-6,4-6 |
| Challenger Barcelona | 2021/10/03 08:00 | Alvaro Lopez San Martin v Daniel Rincon | 4-6,7-5,6-3 |
| Challenger Maia | 2021/12/17 12:55 | Nuno Borges v Nikolas Sanchez Izquierdo | 6-4,6-4 |
| Challenger Maia | 2021/12/16 14:20 | Nikolas Sanchez Izquierdo v Gastao Elias | 6-1,6-7,6-3 |
| Challenger Maia | 2021/12/13 14:30 | Javier Barranco Cosano v Nikolas Sanchez Izquierdo | 4-6,6-4,4-6 |
| Challenger Maia | 2021/12/08 11:00 | Geoffrey Blancaneaux v Nikolas Sanchez Izquierdo | 6-3,3-6,6-2 |
| Challenger Antalya | 2021/11/30 12:30 | Nikolas Sanchez Izquierdo v Oliver Crawford | 1-6,3-6 |
| Challenger Bari | 2021/11/23 11:30 | Nikolas Sanchez Izquierdo v Flavio Cobolli | 6-3,2-6,0-6 |
| Challenger Pau | 2021/11/15 10:00 | Nikolas Sanchez Izquierdo v Georgii Kravchenko | 1-6,2-6 |
| Challenger Pau | 2021/11/14 11:15 | Nikolas Sanchez Izquierdo v Piotr Matuszewski | 6-2,6-1 |