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SHEBOYGAN, WI - AUGUST 11: Zach Johnson of the United States speaks to the media during a press conference in a practice round prior to the 2015 PGA Championship at Whistling Straits on August 11, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

SHEBOYGAN, WI - AUGUST 11:  Zach Johnson of the United States speaks to the media during a press conference in a practice round prior to the 2015 PGA Championship at Whistling Straits on August 11, 2015 in Sheboygan, Wisconsin.  (Photo by Kevin C. Cox/Getty Images)