Zi Yan defeated Beier Ko 6-0 6-0 in the Columbus 25K round of 16 on hard.
Yan Z. took it in straight sets.
Zi Yan beat Beier Ko 6-0 6-0. Umpiry, "Zi Yan vs Beier Ko — Columbus 25K Round of 16", https://umpiry.com/match/2003-02-17/ko-vs-yan-columbus-25k-r16?utm_source=cite (as of 17 February 2003).