Tamarine Tanasugarn defeated Ai Sugiyama 6-1 6-3 in the Fed Cup G1 RRA: JPN vs THA round robin on hard. The upset overturned the form book — Ai Sugiyama came in leading the head-to-head 4–0, but Tamarine Tanasugarn had been the form player, winning 2 of their last 6 on hard. Tamarine Tanasugarn claimed a first win over Ai Sugiyama in five meetings, narrowing 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 |
| 2001-07-30 | San Diego | R64 | hard | Ai Sugiyama | 4-6 7-6(3) 6-2 |
| 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 (147 vs 172). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About