Polona Hercog defeated Maria Sakkari 6-4 6-2 in the Istanbul semi-final on clay. The upset overturned the form book — Maria Sakkari came in ranked #37, leading the head-to-head 1–0, defending last year's round of 16. Polona Hercog claimed a first win over Maria Sakkari in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-05-10 | Rome | R64 | clay | Maria Sakkari | 7-6(6) 3-6 6-2 |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (200 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Hercog P.: 1 day rest · 1 match, 26 games (7d) · Sakkari M.: 1 day rest · 1 match, 19 games (7d). Higher means fresher. About