Jin Young Ko takes 2-shot lead in Boston after Haeran Ryu falls apart

Ryu was coming off a career-best 62 on the TPC Boston that staked the 23-year-old from South Korea to a six-shot lead going into the weekend of the $3.8 million event. Ryu took double bogey on the first and fourth holes, both typically tame on the Gil Hanse design, and then dropped another shot on the tough par-4 sixth. Ryu had a 78, and went from a six-shot lead to four shots behind.

Jin Young Ko takes 2-shot lead in Boston after Haeran Ryu falls apart

Jin Young Ko takes 2-shot lead in Boston after Haeran Ryu falls apart

Jin Young Ko takes 2-shot lead in Boston after Haeran Ryu falls apart

Jin Young Ko takes 2-shot lead in Boston after Haeran Ryu falls apart

Jin Young Ko takes 2-shot lead in Boston after Haeran Ryu falls apart