Chiaki Okadaue defeated Erika Takao 6-3 7-5 in the Tsukuba 25K round of 32 on hard. The upset overturned the form book — Erika Takao came in leading the head-to-head 3–0. Chiaki Okadaue claimed a first win over Erika Takao in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-10-15 | Makinohara 25K | R16 | carpet | Erika Takao | 6-3 6-4 |
| 2006-07-31 | Tokachi 250K | R32 | carpet | Erika Takao | 6-2 7-6(7) |
| 2006-07-03 | Nagoya 25K | SF | hard | Erika Takao | 4-6 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.