Ai Sugiyama defeated Kim Clijsters 6-3 6-3 in the San Diego round of 32 on hard. The upset overturned the form book — Kim Clijsters came in leading the head-to-head 6–2, defending last year's round of 32. Ai Sugiyama narrowed the head-to-head to 6–3.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-08-29 | US Open | R32 | hard | Kim Clijsters | 6-1 6-4 |
| 2005-07-25 | Stanford | R16 | hard | Kim Clijsters | 6-1 6-2 |
| 2003-06-23 | Wimbledon | R16 | grass | Kim Clijsters | 6-3 6-2 |
| 2003-05-12 | Rome | SF | clay | Kim Clijsters | 6-3 6-2 |
| 2003-02-24 | Scottsdale | F | hard | Ai Sugiyama | 3-6 7-5 6-4 |
| 2001-03-08 | Indian Wells | R16 | hard | Kim Clijsters | 6-4 4-6 6-2 |
| 2000-10-30 | Leipzig | R32 | carpet | Kim Clijsters | 6-0 6-2 |
| 2000-05-29 | Roland Garros | R128 | clay | Ai Sugiyama | 6-2 3-6 6-2 |
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 (172 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About