Ryota Hisamatsu advanced when Woong Sun Jun retired 7-6 4-1 in the Japan F7 round of 32.
Hisamatsu R. advanced when Sun Jun W. retired.
Ryota Hisamatsu beat Woong Sun Jun 7-6(1) 4-1 after Woong Sun Jun retired. Umpiry, "Ryota Hisamatsu vs Woong Sun Jun — Japan F7 Round of 32", https://umpiry.com/match/2011-06-20/hisamatsu-vs-jun-japan-f7-r32?utm_source=cite (as of 20 June 2011).