McDowell held his nerve in fierce winds to clinch his second PGA Tour title with a playoff victory over US Open champion Webb Simpson.
Charley Hoffman had four birdies his first five holes en route to a 5-under 66, taking a two-stroke lead at 11-under over Webb Simpson.
Englishman Davis piled up six birdies in a sizzling seven-hole stretch from the par-five fifth on the way to a six-under-par 65.
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