Magui Serna defeated Kimberly Po Messerli 6-4 6-3 in the US Open round of 32 on hard. The upset overturned the form book — Kimberly Po Messerli came in leading the head-to-head 1–0, but Magui Serna had been the form player, winning 2 of their last 4 on hard. Magui Serna claimed a first win over Kimberly Po Messerli in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-08-04 | Manhattan Beach | R32 | hard | Kimberly Po Messerli | 7-5 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.