Stadium: Court 18 Round: 28 Ground: Hardcourt outdoor
| 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 |
| Challenger Buenos Aires | 2021/10/19 15:40 | Juan Pablo Ficovich v Nikolas Sanchez Izquierdo | 7-6,7-6 |
| Challenger Barcelona | 2021/10/05 13:35 | Nikolas Sanchez Izquierdo v Teymuraz Gabashvili | 5-7,2-6 |
| Challenger Murcia | 2021/09/28 10:50 | Nikolas Sanchez Izquierdo v Tallon Griekspoor | 3-6,1-6 |
| Challenger Braga | 2021/09/25 13:30 | Nikola Milojevic v Nikolas Sanchez Izquierdo | 6-2,6-4 |
| Challenger Braga | 2021/09/25 10:00 | Nikolas Sanchez Izquierdo v Taro Daniel | 6-3,6-2 |
| Challenger Manama | 2021/11/24 08:00 | Evgeny Karlovskiy v Johannes Haerteis | 6-3,6-1 |
| Challenger Manama | 2021/11/23 11:40 | Johannes Haerteis v Alexander Erler | 6-3,6-4 |
| Challenger Manama | 2021/11/22 08:00 | Johannes Haerteis v Alexandar Lazarov | 3-6,6-7 |
| Challenger Manama | 2021/11/21 10:05 | Johannes Haerteis v Ammar Faleh Alhogbani | 6-2,6-1 |
| Challenger Helsinki | 2021/11/14 09:00 | Johannes Haerteis v Viktor Durasovic | 4-6,6-7 |
| Challenger Eckental | 2021/11/02 18:15 | Maxime Cressy v Johannes Haerteis | 6-7,6-4,6-3 |
| Challenger Eckental | 2021/11/01 11:15 | Johannes Haerteis v Uladzimir Ignatik | 4-6,6-2,7-6 |
| Challenger Eckental | 2021/10/31 13:30 | Lucas Miedler v Johannes Haerteis | 3-6,7-5,3-6 |