Daniela Hantuchova defeated Ai Sugiyama 1-6 7-5 6-4 in the Zurich round of 32 on hard. The upset overturned the form book — Ai Sugiyama came in leading the head-to-head 6–4, defending last year's quarter-final, but Daniela Hantuchova had been the form player, winning 2 of their last 5 on hard. Daniela Hantuchova narrowed the head-to-head to 6–5.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-22 | Wimbledon | R32 | grass | Daniela Hantuchova | 6-4 6-3 |
| 2008-08-11 | Olympics | R64 | hard | Daniela Hantuchova | 6-2 7-5 |
| 2008-07-14 | Stanford | R16 | hard | Ai Sugiyama | 6-3 6-1 |
| 2008-03-24 | Miami | R32 | hard | Ai Sugiyama | 6-4 6-7(8) 7-5 |
| 2006-10-16 | Zurich | R16 | hard | Daniela Hantuchova | 7-6(7) 6-2 |
| 2005-08-01 | San Diego | R32 | hard | Ai Sugiyama | 7-5 4-6 6-2 |
| 2004-10-25 | Linz | R16 | hard | Ai Sugiyama | 6-2 6-1 |
| 2004-08-02 | Montreal | R32 | hard | Ai Sugiyama | 1-6 6-4 6-4 |
| 2004-06-14 | Eastbourne | QF | grass | Daniela Hantuchova | 6-1 7-6(7) |
| 2002-07-29 | San Diego | R32 | hard | Ai Sugiyama | 6-4 1-6 7-5 |
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 149). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About