Kiwi teen overcomes a four-shot deficit to force a playoff, going on to win $2.6m LPGA event.
Phil Mickelson has pulled out of the World Golf Championships for personal reasons.
Kiwi golfer finishes with another top-25 result on the PGA Tour this season.
World No 9 battles difficult conditions for a birdie-birdie finish to clinch a one-shot win on the PGA Tour.
Kiwi golfer Michael Hendry finishes in a tie for 31st in European Tour event.