Amy Frazier defeated Martina Hingis 6-3 6-3 in the San Diego quarter-final on hard. The upset overturned the form book — Martina Hingis came in leading the head-to-head 4–0, defending the title, but Amy Frazier had been the form player, winning 4 of their last 8 on hard. Amy Frazier claimed a first win over Martina Hingis in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-08-06 | Los Angeles | QF | hard | Martina Hingis | 6-2 6-3 |
| 2000-03-10 | Indian Wells | R64 | hard | Martina Hingis | 6-3 6-3 |
| 1999-11-08 | Philadelphia | QF | carpet | Martina Hingis | 7-6 6-4 |
| 1999-03-18 | Key Biscayne | R32 | hard | Martina Hingis | 6-1 6-1 |
Averages over each player's completed matches in the selected window (34 vs 84). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About