Samantha Stosur defeated Serena Williams 6-2 6-7 8-6 in the Roland Garros quarter-final on clay. The upset overturned the form book — Serena Williams came in leading the head-to-head 8–3, defending last year's quarter-final. Samantha Stosur narrowed the head-to-head to 8–4.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2014-09-29 | Beijing | QF | hard | Samantha Stosur | DEF |
| 2014-08-11 | Cincinnati | R32 | hard | Serena Williams | 7-6(7) 7-6(7) |
| 2014-08-04 | Montreal | R32 | hard | Serena Williams | 6-0 6-2 |
| 2012-04-02 | Charleston | SF | clay | Serena Williams | 6-1 6-1 |
| 2012-03-19 | Miami | R16 | hard | Serena Williams | 7-5 6-3 |
| 2011-08-29 | US Open | F | hard | Samantha Stosur | 6-2 6-3 |
| 2011-08-08 | Toronto | F | hard | Serena Williams | 6-4 6-2 |
| 2010-01-18 | Australian Open | R16 | hard | Serena Williams | 6-4 6-2 |
| 2009-07-27 | Stanford | QF | hard | Samantha Stosur | 6-2 3-6 6-2 |
| 2009-01-12 | Sydney | R32 | hard | Serena Williams | 6-3 6-7(4) 7-5 |
| 2008-08-11 | Olympics | R32 | hard | Serena Williams | 6-2 6-0 |
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 199). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About