Miyazato, the ninth-ranked Japanese player who has seven LPGA victories, birdied Nos. 14-16 and closed with two pars for a bogey-free round in partly cloudy, breezy conditions at Wildfire Golf Club. The weather is expected to be a big factor Sunday, with the temperature plunging into the 50s and rain and strong winds forecast.
Tseng had a chance to take the outright lead on the par-4 18th after hitting to 10 feet out of the right fairway bunker, but her birdie putt rolled just past the left edge. The top-ranked Taiwanese star settled for a 67 to match Miyazato at 14 under.
Tseng successfully defended her LPGA Thailand title in February for her 13th LPGA victory. She led the tour last season with seven victories'including major victories in the LPGA Championship and Womens British Open'and finished the year with 12 worldwide titles.