Ryu (70) takes one-shot lead going into weekend at Mediheal

DALY CITY, Calif. — So Yeon Ryu shot a 2-under 70 on Friday afternoon at difficult Lake Merced to take a one-stroke lead over follow South Korean player Sei Young Kim and American Ryann O'Toole in the LPGA MEDIHEAL Championship.

Tied for the first-round lead with Eun-Hee Ji and Anne van Dam after a 67, Ryu chipped in for birdie from the fringe on the par-3 12th, but gave back the stroke with a bogey on the par-4 16th after advancing a chip from deep rough only to the fringe.

''It was just a grinding day,'' Ryu said. ''And I just grinded and grinded and grinded. ... I was pretty mentally tough.''

Ryu was at 7-under 137 on the tree-lined course with tricky greens made tougher with shifting winds.

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