Nina Duebbers defeated Antonella Serra Zanetti 6-1 6-4 in the San Luis Potosi 25K round of 16 on clay. The upset overturned the form book — Antonella Serra Zanetti came in leading the head-to-head 1–0. Nina Duebbers claimed a first win over Antonella Serra Zanetti in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2000-10-09 | Welwyn 25K | R16 | hard | Antonella Serra Zanetti | 4-0 4-5(5) 4-1 4-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.