Wood, who led by as many five strokes in the final round, bogeyed two of the last three holes but still had enough of a cushion to claim the victory with a 1-under 71.
He finished 72 holes at 19-under-par 269 for his 17th triumph in a World Golf Championship event.
Steve Stricker grabbed sole possession of second place a 4-under 68, ending at 17-under 271.
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