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SHEBOYGAN, WI - AUGUST 16: Dustin Johnson of the United States plays his shot from the first tee during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Mike Ehrmann/PGA of America via Getty Images)

SHEBOYGAN, WI - AUGUST 16:  Dustin Johnson of the United States plays his shot from the first tee during the final round of the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin.  (Photo by Mike Ehrmann/PGA of America via Getty Images)