Samantha Stosur defeated Simona Halep 6-0 6-2 in the Roland Garros round of 64 on clay. The upset overturned the form book — Simona Halep came in leading the head-to-head 6–3, defending last year's round of 128. Samantha Stosur narrowed the head-to-head to 6–4.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-05-08 | Madrid | R16 | clay | Simona Halep | 6-4 4-6 6-4 |
| 2017-03-20 | Miami | R16 | hard | Simona Halep | 4-6 7-5 6-2 |
| 2016-05-23 | Roland Garros | R16 | clay | Samantha Stosur | 7-6(0) 6-3 |
| 2016-05-02 | Madrid | SF | clay | Simona Halep | 6-2 6-0 |
| 2013-10-28 | Tournament of Champions | F | hard | Simona Halep | 2-6 6-2 6-2 |
| 2013-10-14 | Moscow | F | hard | Simona Halep | 7-6(1) 6-2 |
| 2013-08-12 | Cincinnati | R16 | hard | Simona Halep | 6-4 4-6 6-2 |
| 2012-08-06 | Montreal | R32 | hard | Samantha Stosur | 7-5 4-4 RET |
| 2010-05-24 | Roland Garros | R128 | clay | Samantha Stosur | 7-5 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 (197 vs 197). ATP, WTA & Challenger.