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OAKMONT, PA - JUNE 13: A detail of the shoes of Rory McIlroy of Northern Ireland during a practice round prior to the U.S. Open at Oakmont Country Club on June 13, 2016 in Oakmont, Pennsylvania. (Photo by Andrew Redington/Getty Images)

OAKMONT, PA - JUNE 13:  A detail of the shoes of Rory McIlroy of Northern Ireland during a practice round prior to the U.S. Open at Oakmont Country Club on June 13, 2016 in Oakmont, Pennsylvania.  (Photo by Andrew Redington/Getty Images)