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SPRINGFIELD, NJ - JULY 28: (L-R) Phil Mickelson of the United States and Rory McIlroy of Northern Ireland walk the 12th hole during the first round of the 2016 PGA Championship at Baltusrol Golf Club on July 28, 2016 in Springfield, New Jersey. (Photo by Stuart Franklin/Getty Images)

SPRINGFIELD, NJ - JULY 28:  (L-R) Phil Mickelson of the United States and Rory McIlroy of Northern Ireland walk the 12th hole during the first round of the 2016 PGA Championship at Baltusrol Golf Club on July 28, 2016 in Springfield, New Jersey.  (Photo by Stuart Franklin/Getty Images)