Kirsten Flipkens defeated Polona Hercog 6-3 6-2 in the Cincinnati round of 64 on hard. The upset overturned the form book — Polona Hercog came in leading the head-to-head 2–1, defending last year's round of 32. Kirsten Flipkens narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-01-01 | Auckland | R16 | hard | Polona Hercog | 6-4 6-2 |
| 2014-06-16 | s Hertogenbosch | R32 | grass | Kirsten Flipkens | 6-4 6-0 |
| 2013-09-09 | Quebec City | R32 | hard | Polona Hercog | 6-3 6-1 |
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 (199 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About