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SHEBOYGAN, WI - AUGUST 16: Jordan Spieth of the United States greets Jason Day of Australia after Day's three-stroke victory at the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin. (Photo by Kevin C. Cox/Getty Images)

SHEBOYGAN, WI - AUGUST 16:  Jordan Spieth of the United States greets Jason Day of Australia after Day's three-stroke victory at the 2015 PGA Championship at Whistling Straits on August 16, 2015 in Sheboygan, Wisconsin.  (Photo by Kevin C. Cox/Getty Images)