Yasufumi Yamamoto defeated Bong Soo Kim 3-6 7-6 6-0 in the Japan Masters 4 qualifying round on hard. The result followed the form book — Yasufumi Yamamoto came in leading the head-to-head 2–0. Yasufumi Yamamoto extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1993-07-18 | Malaysia 2 Masters 3 | R16 | hard | Yasufumi Yamamoto | 6-2 6-1 |
| 1991-11-04 | Japan Masters 3 | R32 | hard | Yasufumi Yamamoto | 6-4 5-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.