Stadium: Center Court Round: 26 Ground: Hardcourt outdoor
| Challenger St. Tropez MD | 2021/09/04 14:45 | Grenier/Muller v Sancic/Sitak | 2-6,6-3,5-10 |
| Challenger St. Tropez MD | 2021/09/02 11:25 | Grenier/Muller v 네둔체지얀 J / 라자 P | 4-6,6-1,10-2 |
| Challenger Biella MD | 2021/06/03 15:10 | Silva/Zuk v Grenier/Muller | 6-2,6-3 |
| Challenger Biella MD | 2021/06/02 13:05 | Collarini/Galdos v Grenier/Muller | 6-7,4-6 |
| Challenger Nur-Sultan MD | 2021/02/25 08:25 | Lenz/Quiroz v Grenier/Muller | 6-4,6-3 |
| Challenger Nur-Sultan MD | 2021/02/24 04:00 | Marterer/Rola v Grenier/Muller | 4-6,4-6 |
| Challenger Banja Luka MD | 2021/09/10 11:00 | Cerretani/Fallert v 산치크 A / 세르다루직 N | 6-7,3-6 |
| Challenger Banja Luka MD | 2021/09/09 09:00 | Cozbinov/Echargui v Cerretani/Fallert | 6-7,5-7 |
| Challenger Banja Luka MD | 2021/09/07 14:20 | Pozzi/Weis v Cerretani/Fallert | 4-6,6-7 |