Yaoki Ishii defeated Yuichi Sugita 7-6 6-3 in the Japan F3 qualifying round on hard. The upset overturned the form book — Yuichi Sugita came in leading the head-to-head 2–0. Yaoki Ishii claimed a first win over Yuichi Sugita in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-03-23 | Japan F2 | QF | hard | Yuichi Sugita | 6-2 6-3 |
| 2008-06-30 | Japan F7 | QF | hard | Yuichi Sugita | 6-3 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.