Tian Tian Sun defeated Seiko Okamoto 6-2 4-6 6-1 in the Shanghai 25K round of 16 on hard. The upset overturned the form book — Seiko Okamoto came in leading the head-to-head 1–0. Tian Tian Sun claimed a first win over Seiko Okamoto in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-01-27 | Tokyo | Q32 | hard | Seiko Okamoto | 6-4 3-6 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.