Ai Sugiyama defeated Tamarine Tanasugarn 4-6 7-6 6-2 in the San Diego round of 64 on hard. The result followed the form book — Ai Sugiyama came in leading the head-to-head 3–1, defending last year's round of 32. Ai Sugiyama extended the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-06-21 | Wimbledon | R16 | grass | Ai Sugiyama | 6-3 7-5 |
| 2003-04-26 | Fed Cup G1 PO: JPN vs THA | RR | hard | Ai Sugiyama | 4-6 6-3 6-4 |
| 2000-04-29 | Fed Cup G1 RRA: JPN vs THA | RR | hard | Tamarine Tanasugarn | 6-1 6-3 |
| 1999-09-20 | Tokyo | R32 | hard | Ai Sugiyama | 6-3 6-3 |
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 147). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About