Yuichi Ito defeated Peng Sun 6-2 7-6 in the China F5 qualifying round on hard. The upset overturned the form book — Peng Sun 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 |
|---|---|---|---|---|---|
| 2009-09-21 | Australia F6 | R16 | hard | Yuichi Ito | 6-3 6-3 |
| 2009-01-12 | China F2 | R32 | hard | Peng Sun | 6-7(5) 6-2 6-4 |
| 2006-06-26 | Japan F8 | QF | hard | Peng Sun | 6-2 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.