Ochoa had no bogeys to finish 6-under 66 at Asia's richest women's golf event at Tanah Merah Country Club.
American Paul Creamer and Japan's Ai Miyazato both had six birdies and a bogey to share second place, a stroke behind Ochoa.
The tournament's field of 78 players features 18 of the top 20 players in the world vying for a top prize of $300,000.
Linda Wessberg of Sweden was two strokes off the lead at 4-under 68, along with South Koreans Kim In-kyung and Lee Jee-young.
Former No. 1 Annika Sorenstam had three birdies and two bogeys to finish 1-under 71 and shared 19th place.
Sorenstam won her 70th LPGA Tour title at the SBS Open this month in Hawaii, ending a 17-month title drought and vaulting her two spots to No. 2 in the world.
Suzann Pettersen of Norway, who had a breakout season last year with five wins including the LPGA Championship, had one birdie and a bogey to finish even par, six strokes off the lead.
Australia's Karrie Webb had a 3-under 69 and shared seventh place.
[Associated Press]
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