Roberta Vinci defeated Karin Knapp 6-0 6-0 in the Toronto round of 64 on hard. The upset overturned the form book — Karin Knapp came in leading the head-to-head 4–2, but Roberta Vinci had been the form player, winning 3 of their last 5 on hard. Roberta Vinci narrowed the head-to-head to 4–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-05-18 | Nuremberg | F | clay | Karin Knapp | 7-6(5) 4-6 6-1 |
| 2015-04-27 | Marrakech | R16 | clay | Karin Knapp | 6-7(3) 6-2 6-2 |
| 2013-08-26 | US Open | R32 | hard | Roberta Vinci | 6-4 6-3 |
| 2012-07-09 | Palermo | R32 | clay | Roberta Vinci | 6-2 6-2 |
| 2012-05-14 | Rome | R64 | clay | Karin Knapp | 6-4 2-6 6-2 |
| 2007-07-16 | Palermo | R32 | clay | Karin Knapp | 2-6 6-2 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 (137 vs 58). ATP, WTA & Challenger.