01/By surface
each with its own count, at equal weight
Hard
4-0
S. leads 4-0 in 4 meetings on hard
Clay
Never on clay
no meeting on this surface
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 11, 2015 | Rogers CupPremier | hard | 2nd round | Williams S. | 2-6, 6-3, 6-0 | 1 v 26 |
| Sep 4, 2014 | US OpenGrand Slam | hard | quarterfinal | Williams S. | 6-3, 6-2 | 1 v 12 |
| Aug 14, 2014 | Western & Southern Financial Group Women's OpenPremier | hard | 3rd round | Williams S. | 6-2, 6-2 | 1 v 14 |
| Mar 21, 2013 | Sony Ericsson OpenPremier | hard | 2nd round | Williams S. | 6-1, 6-1 | 1 v 103 |
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 Pennetta F. each carry the table against every opponent faced.