Seong Kon Kim defeated Ryuso Tsujino 7-6 6-2 in the Korea Masters 4 qualifying round on clay.
Kon Kim S. took it in straight sets.
Seong Kon Kim beat Ryuso Tsujino 7-6 6-2. Umpiry, "Seong Kon Kim vs Ryuso Tsujino — Korea Masters 4 Qualifying Round", https://umpiry.com/match/1991-05-20/kim-vs-tsujino-korea-masters-4-qf?utm_source=cite (as of 20 May 1991).