Kai Chen Chang defeated Samantha Stosur 6-4 4-6 7-6 in the Osaka semi-final on hard. The upset overturned the form book — Samantha Stosur came in leading the head-to-head 1–0, defending last year's final. Kai Chen Chang claimed a first win over Samantha Stosur in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-01-14 | Australian Open | R128 | hard | Samantha Stosur | 7-6(3) 6-3 |
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 (73 vs 197). ATP, WTA & Challenger.