Nadia Petrova defeated Ai Sugiyama 6-1 7-6 in the Doha semi-final on hard. The upset overturned the form book — Ai Sugiyama came in defending last year's round of 16, but Nadia Petrova had been the form player, winning 3 of their last 7 on hard. Nadia Petrova extended the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-09-28 | Tokyo | R64 | hard | Nadia Petrova | 6-0 2-1 RET |
| 2004-01-05 | Gold Coast | F | hard | Ai Sugiyama | 1-6 6-1 6-4 |
| 2003-10-20 | Linz | F | hard | Ai Sugiyama | 7-5 6-4 |
| 2003-01-13 | Australian Open | R64 | hard | Nadia Petrova | 6-4 6-4 |
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 (200 vs 141). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About