Seiko Okamoto defeated Tian Tian Sun 6-4 3-6 6-2 in the Tokyo q32 on hard. The upset overturned the form book — Tian Tian Sun came in leading the head-to-head 1–0. Seiko Okamoto claimed a first win over Tian Tian Sun in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2002-05-13 | Shanghai 25K | R16 | hard | Tian Tian Sun | 6-2 4-6 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.