Dong Hak Sin defeated Sung Hyuk Yu 6-1 6-3 in the Korea F6 qualifying round of 16 on hard.
Hak Sin D. took it in straight sets.
Dong Hak Sin beat Sung Hyuk Yu 6-1 6-3. Umpiry, "Dong Hak Sin vs Sung Hyuk Yu — Korea F6 Qualifying Round of 16", https://umpiry.com/match/2013-06-10/sin-vs-yu-korea-f6-q16?utm_source=cite (as of 10 June 2013).