Mirielle Dittmann defeated Tiffany Welford 6-4 6-3 in the Lenzerheide 25K round of 32 on clay. The upset overturned the form book — Tiffany Welford came in leading the head-to-head 1–0. Mirielle Dittmann claimed a first win over Tiffany Welford in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-11-15 | Nuriootpa 25K | R32 | hard | Tiffany Welford | 6-2 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.