Overnight US Women's Open leader leaves door open with a 74

Overnight leader South Korean Na Yeon Choi returned a second-round 74 - three over par for the testing Sucon Valley Country Club course - and her 36-hole even-par total of 142 looked vulnerable with more than half the field still to come in.
Lorena Ochoa, Cristie Kerr and Jean Reynolds were all late starters on the second day.
Florida 14-year-old amateur Alexis Thompson is in position to make the cut for the first time in three tries. She followed her even-par opening round with a 73 for a two-over total of 144.
The field will be cut to the 60 lowest scores and ties, and any player within 10 shots of the lead, after 36 holes.