Round: 26 Ground: Hardcourt indoor
| Challenger - Nur-Sultan - Herredouble | 2022/07/20 14:00 | Istomin/Karlovskiy v Donskoy/Kachmazov | 3-6,6-4,8-10 |
| Challenger - Quimper - Herredouble | 2021/02/03 09:30 | Istomin/Karlovskiy v Drzewiecki/Walkow | 6-7,5-7 |
| Challenger Winnetka MD | 2019/07/09 21:00 | Istomin/Karlovskiy v Maytin/Withrow | 6-1,4-6,10-2 |