Andrea Petkovic defeated Vitalia Diatchenko 6-2 2-6 6-3 in the St. Petersburg qualifying round 1 on hard. The upset overturned the form book — Vitalia Diatchenko came in leading the head-to-head 1–0, but Andrea Petkovic had been the form player, winning 3 of their last 8 on hard. Andrea Petkovic claimed a first win over Vitalia Diatchenko in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-08-21 | New Haven | Q32 | hard | Vitalia Diatchenko | 4-6 6-2 6-4 |
Averages over each player's completed matches in the selected window (137 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About