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OAKMONT, PA - JUNE 18: Rory McIlroy of Northern Ireland waits to tee of on the 16th tee during the continuation of the second round of the U.S. Open at Oakmont Country Club on June 18, 2016 in Oakmont, Pennsylvania. (Photo by Christian Petersen/Getty Images)

OAKMONT, PA - JUNE 18: Rory McIlroy of Northern Ireland waits to tee of on the 16th tee during the continuation of the second round of the U.S. Open at Oakmont Country Club on June 18, 2016 in Oakmont, Pennsylvania.  (Photo by Christian Petersen/Getty Images)