Dong Hak Sin defeated Riaan Du Toit 5-7 6-2 6-2 in the USA F4 qualifying round of 64 on clay.
Hak Sin D. came through in three sets.
Dong Hak Sin beat Riaan Du Toit 5-7 6-2 6-2. Umpiry, "Dong Hak Sin vs Riaan Du Toit — USA F4 Qualifying Round of 64", https://umpiry.com/match/2016-01-18/sin-vs-toit-usa-f4-q64?utm_source=cite (as of 18 January 2016).