Stadium: Court 1 Round: 27 Ground: Clay
| Challenger Losinj MD | 2021/10/20 08:00 | Haase/Hermans v Genov/Nokic | 6-4,6-4 |
| Challenger Losinj MD | 2021/10/20 14:50 | Alvarez Varona/Kravchenko v Sancic/Sitak | 6-7,1-6 |
| Challenger Alicante MD | 2021/10/12 14:45 | Sancic/Sitak v Nava/Verdasco | 3-6,6-4,6-10 |
| ATP San Diego MD | 2021/09/30 01:20 | Sancic/Sitak v Thompson/Withrow | 3-6,4-6 |
| Challenger Istanbul MD | 2021/09/18 13:20 | Sancic/Sitak v Albot/Cozbinov | 6-4,5-7,9-11 |
| Challenger Istanbul MD | 2021/09/17 11:15 | Sancic/Sitak v Gonzales/Johnson | 4-6,6-2,10-5 |
| Challenger Istanbul MD | 2021/09/16 13:30 | Sancic/Sitak v Blancaneaux/Fabbiano | 6-0,6-7,13-11 |
| Challenger Istanbul MD | 2021/09/15 10:30 | Sancic/Sitak v Agabigun/Altuna | 6-2,6-3 |
| Challenger Saint-Tropez MD | 2021/09/04 16:25 | Arneodo/Guinard v Sancic/Sitak | 6-7,4-6 |