Park turned in a bogey-free, 6-under 66 at the Aviara Golf Club for a one-shot advantage over LPGA Hall of Famer Karrie Webb and Caroline Hedwall.
Tseng overslept Wednesday and missed the starting time for her pro-am pairing. Under LPGA Tour rules, anyone failing to show up for the pro-am event is not allowed to play in that week's tournament.
Lewis, in her first week with the No. 1 ranking, a 2-under 70 and was tied for 16th place. She won the Founders Cup event last week, the first tour stop in the United States this year.
McPhee, Cokas 'working on their marriage' after affair
LGBT community has 'bullied the American people': Bachmann