Nina Duebbers defeated Olivia Sanchez 7-5 6-4 in the Valladolid 25K round of 16 on hard. The upset overturned the form book — Olivia Sanchez came in leading the head-to-head 1–0. Nina Duebbers claimed a first win over Olivia Sanchez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2001-07-16 | Valladolid 25K | R32 | hard | Olivia Sanchez | 3-6 7-6(6) 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.