Ochoa closed with a 3-under-par 69 for a 19-under 269.
The victory tied the LPGA Tour record for consecutive wins in scheduled events.
"I'm just glad I hung in there and I was able to finish strong," Ochoa said. "I'm just trying to enjoy my moment. And I would like to enjoy it for a long time."
Three other players have won four consecutive tour events -- Mickey Wright (1962 and 1963), Kathy Whitworth (1969) and Annika Sorenstam (2001).
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