01/By surface
each with its own count, at equal weight
Hard
3-0
S. leads 3-0 in 3 meetings on hard
Clay
1-0
S. leads 1-0 in 1 meeting on clay
Grass
Never on grass
no meeting on this surface
02/Every meeting
4 rows, newest first
| Date | Tournament | Surface | Round | Winner | Score, winner first | Ranks, S. first |
|---|---|---|---|---|---|---|
| Aug 14, 2015 | Rogers CupPremier | hard | 3rd round | Williams S. | 6-3, 6-2 | 1 v 16 |
| Aug 2, 2014 | Bank of the West ClassicPremier | hard | semifinal | Williams S. | 7-5, 6-0 | 1 v 18 |
| May 14, 2014 | Internazionali BNL d'ItaliaPremier | clay | 2nd round | Williams S. | 6-2, 6-2 | 1 v 28 |
| Dec 31, 2013 | Brisbane InternationalPremier | hard | 2nd round | Williams S. | 6-4, 6-4 | 1 v 43 |
A record, never a share of meetings. Main-draw singles since 2013; a meeting ended by retirement is counted with the sets that were played and marked; a walkover is listed and counted in neither column. Williams S. and Petkovic A. each carry the table against every opponent faced.