Altug Celikbilek defeated Egor Gerasimov 7-5 6-4 in the Porto CH quarter-final on hard. The upset overturned the form book — Egor Gerasimov came in leading the head-to-head 1–0, but Altug Celikbilek had been the form player, winning 8 of their last 10 on hard. Altug Celikbilek claimed a first win over Egor Gerasimov in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-09-27 | Sofia | Q2 | hard | Egor Gerasimov | 7-6 6-3 |
Averages over each player's completed matches in the selected window (166 vs 166). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About