Hee Seok Chung defeated Danai Udomchoke 6-1 6-3 in the Korea Rep F2 qualifying round on clay. Hee Seok Chung extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-02-07 | Davis Cup G1 R1: THA vs KOR | RR | hard | Danai Udomchoke | 6-1 6-3 |
| 2000-05-29 | Korea F2 | QF | clay | Hee Seok Chung | 7-5 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.