Antonella Serra Zanetti defeated Nina Duebbers 4-0 4-5 4-1 4-1 in the Welwyn 25K round of 16 on hard. The upset overturned the form book — Nina Duebbers came in leading the head-to-head 1–0. Antonella Serra Zanetti claimed a first win over Nina Duebbers in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-04-09 | San Luis Potosi 25K | R16 | clay | Nina Duebbers | 6-1 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.