Ken Onishi advanced when Young Seok Lee retired 7-6 2-0 in the M15 Daegu 1 qualifying round of 16.
Onishi K. advanced when Seok Lee Y. retired.
Ken Onishi beat Young Seok Lee 7-6(6) 2-0 after Young Seok Lee retired. Umpiry, "Ken Onishi vs Young Seok Lee — M15 Daegu 1 Qualifying Round of 16", https://umpiry.com/match/2019-06-03/lee-vs-onishi-m15-daegu-1-q16?utm_source=cite (as of 3 June 2019).