Timur Kiuamov defeated Maxim Ratniuk 6-2 7-5 in the M15 Monastir 1 round of 32 on hard. The upset overturned the form book — Maxim Ratniuk came in leading the head-to-head 1–0. Timur Kiuamov claimed a first win over Maxim Ratniuk in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-04-05 | M15 St. Petersburg 3 | Q16 | hard | Maxim Ratniuk | 6-4 6-7(5) 12-10 |