Roberta Vinci defeated Heather Watson 6-3 6-4 in the St. Petersburg qualifying round 1 on hard. The upset overturned the form book — Heather Watson came in leading the head-to-head 2–1, but Roberta Vinci had been the form player, winning 3 of their last 5 on hard. Roberta Vinci narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-05-11 | Rome | R64 | clay | Heather Watson | 6-3 6-1 |
| 2015-01-12 | Hobart | QF | hard | Heather Watson | 7-6(0) 6-2 |
| 2012-06-11 | Birmingham | R16 | grass | Roberta Vinci | 6-3 4-6 6-1 |
Averages from each player's recent completed matches (20 vs 20). ATP, WTA & Challenger.