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SHEBOYGAN, WI - AUGUST 13: Dustin Johnson of the United States lines up a putt on the 18th green during the first round of the 2015 PGA Championship at Whistling Straits on August 13, 2015 in Sheboygan, Wisconsin. (Photo by Richard Heathcote/Getty Images)

SHEBOYGAN, WI - AUGUST 13:  Dustin Johnson of the United States lines up a putt on the 18th green during the first round of the 2015 PGA Championship at Whistling Straits on August 13, 2015 in Sheboygan, Wisconsin.  (Photo by Richard Heathcote/Getty Images)