Yaoki Ishii defeated Mao Xin Gong 7-5 6-4 in the Japan F1 round of 32 on hard. The upset overturned the form book — Mao Xin Gong came in leading the head-to-head 1–0, but Yaoki Ishii had been the form player, winning 3 of their last 8 on hard. Yaoki Ishii claimed a first win over Mao Xin Gong in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-05-04 | China F3 | R16 | hard | Mao Xin Gong | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.