Kento Takeuchi defeated Yaoki Ishii 7-6 7-5 in the Japan F5 round of 16 on carpet. The upset overturned the form book — Yaoki Ishii came in leading the head-to-head 2–0. Kento Takeuchi claimed a first win over Yaoki Ishii in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2008-10-20 | Japan F11 | R32 | hard | Yaoki Ishii | 6-4 6-4 |
| 2007-09-10 | Japan F8 | R16 | hard | Yaoki Ishii | 2-6 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.