Peerakiat Siriluethaiwattana defeated Yaoki Ishii 7-5 6-3 in the Thailand F1 round of 16 on hard. The upset overturned the form book — Yaoki Ishii came in leading the head-to-head 1–0. Peerakiat Siriluethaiwattana claimed a first win over Yaoki Ishii in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-06-22 | Japan F6 | R16 | carpet | Yaoki Ishii | 7-5 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.