Yuichi Ito defeated Yaoki Ishii 6-1 6-1 in the Japan F9 round of 32 on carpet. The upset overturned the form book — Yaoki Ishii came in leading the head-to-head 2–1. Yuichi Ito narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2007-09-10 | Japan F8 | SF | hard | Yuichi Ito | 3-6 6-2 6-4 |
| 2005-04-18 | Japan F2 | R32 | clay | Yaoki Ishii | 6-2 6-0 |
| 2005-04-11 | Japan F1 | R16 | carpet | Yaoki Ishii | 6-2 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.