Risa Ushijima defeated Chiaki Okadaue 6-4 6-4 in the Tokyo Ariake $10K round of 32 on hard. The upset overturned the form book — Chiaki Okadaue came in leading the head-to-head 1–0, but Risa Ushijima had been the form player, winning 6 of their last 7 on hard. Risa Ushijima claimed a first win over Chiaki Okadaue in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2013-03-18 | Kofu 10K | R16 | hard | Chiaki Okadaue | 6-3 6-3 |