Ai Koga defeated Yumi Nakano 6-4 6-4 in the New Orleans LA 10K round of 32 on hard. The upset overturned the form book — Yumi Nakano came in leading the head-to-head 1–0. Ai Koga claimed a first win over Yumi Nakano in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2011-05-30 | Mie 10K | R32 | carpet | Yumi Nakano | 6-4 6-1 |