Gengo Kikuchi defeated Jung Woong Na 4-6 7-5 6-0 in the Japan F8 qualifying round on hard. The upset overturned the form book — Jung Woong Na came in leading the head-to-head 2–0, but Gengo Kikuchi had been the form player, winning 4 of their last 4 on hard. Gengo Kikuchi claimed a first win over Jung Woong Na in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2015-09-07 | Korea F7 | R16 | clay | Jung Woong Na | 6-3 6-3 |
| 2013-03-11 | Japan F1 | R16 | hard | Jung Woong Na | 6-1 7-5 |
Averages over each player's completed matches in the selected window (57 vs 62). ATP, WTA & Challenger.
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About