Hyun Woo Nam defeated Jae Min Seol 6-2 6-1 in the Japan F6 round of 32 on grass. The upset overturned the form book — Jae Min Seol came in leading the head-to-head 2–1. Hyun Woo Nam narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2017-04-24 | Kazakhstan F5 | R32 | clay | Jae Min Seol | 6-2 6-4 |
| 2013-03-25 | Japan F3 | QF | hard | Hyun Woo Nam | 6-3 6-1 |
| 2012-07-16 | India F10 | R16 | hard | Jae Min Seol | 6-2 6-2 |
Averages over each player's completed matches in the selected window (13 vs 9). 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