Kentaro Masuda defeated Yong Il Yoon 6-3 6-4 in the Japan F6 qualifying round on hard. The upset overturned the form book — Yong Il Yoon came in leading the head-to-head 2–0, but Kentaro Masuda had been the form player, winning 1 of their last 4 on hard. Kentaro Masuda claimed a first win over Yong Il Yoon in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1993-11-08 | Japan Masters 4 | R32 | hard | Yong Il Yoon | 2-6 6-1 6-2 |
| 1992-08-10 | Chinese Taipei Masters 4 | QF | hard | Yong Il Yoon | 6-4 7-5 |