Maria Joao Koehler defeated Nadiya Kichenok 1-6 6-1 6-3 in the Donetsk 50K round of 16 on hard. The upset overturned the form book — Nadiya Kichenok came in leading the head-to-head 1–0. Maria Joao Koehler claimed a first win over Nadiya Kichenok in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-07-22 | Astana 100K | F | hard | Nadiya Kichenok | 6-4 7-5 |
Averages over each player's completed matches in the selected window (22 vs 54). 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