Stefan Kozlov defeated Michail Pervolarakis 6-1 6-4 in the M25 Porto 1 round of 32 on hard. The upset overturned the form book — Michail Pervolarakis came in leading the head-to-head 1–0. Stefan Kozlov claimed a first win over Michail Pervolarakis in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-06-16 | M25 Tulsa 1 | R32 | hard | Michail Pervolarakis | 7-6(4) 6-4 |
Averages over each player's completed matches in the selected window (199 vs 65). ATP, WTA & Challenger.
Kozlov S.: 1 day rest · 4 matches, 93 games (7d). Higher means fresher. About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About