Stadium: Court 1 Round: 27 Ground: Carpet indoor
| Challenger Ismaning MD | 2021/10/27 13:30 | Sancic/Sitak v Cozbinov/Cressy | 7-6,5-7,10-4 |
| Challenger Losinj MD | 2021/10/23 10:00 | Cornea/Kirkin v Sancic/Sitak | 0-6,6-0,10-5 |
| Challenger Losinj MD | 2021/10/21 14:40 | Haase/Hermans v Sancic/Sitak | 5-7,4-6 |
| 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 Ismaning MD | 2021/10/26 16:35 | Cornea/Ramanathan v Sandkaulen/Squire | 6-3,3-6,10-7 |