Jan Satral defeated Daniil Glinka 6-4 6-3 in the M15 St. Petersburg 3 round of 16 on hard. The upset overturned the form book — Daniil Glinka came in leading the head-to-head 1–0. Jan Satral claimed a first win over Daniil Glinka in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-04-14 | M15 St. Petersburg 4 | R32 | hard | Daniil Glinka | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.