SHEBOYGAN, WI - AUGUST 11: Rory McIlroy of Northern Ireland walks during 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: Rory McIlroy of Northern Ireland walks during 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)