Peng Sun defeated Yuichi Ito 6-7 6-2 6-4 in the China F2 round of 32 on hard. The upset overturned the form book — Yuichi Ito came in leading the head-to-head 2–1, but Peng Sun had been the form player, winning 3 of their last 9 on hard. Peng Sun 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 |
| 2009-08-03 | China F5 | QF | hard | Yuichi Ito | 6-2 7-6(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.