Lilia Osterloh defeated Miho Saeki 6-4 6-3 in the Oklahoma round of 16 on hard. The upset overturned the form book — Miho Saeki came in defending last year's round of 16, but Lilia Osterloh had been the form player, winning 4 of their last 10 on hard. Lilia Osterloh extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-03-22 | Redding CA 25K | R16 | hard | Miho Saeki | 6-3 5-7 6-4 |
| 1997-10-28 | Austin TX 75K | R32 | hard | Lilia Osterloh | 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.