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SHEBOYGAN, WI - AUGUST 13: Rory McIlroy of Northern Ireland and Jordan Spieth of the United States look over a green during the first round of the 2015 PGA Championship at Whistling Straits on August 13, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

SHEBOYGAN, WI - AUGUST 13:  Rory McIlroy of Northern Ireland and Jordan Spieth of the United States look over a green during the first round of the 2015 PGA Championship at Whistling Straits on August 13, 2015 in Sheboygan, Wisconsin.  (Photo by Kevin C. Cox/Getty Images)