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OAKMONT, PA - JUNE 15: Phil Mickelson of the United States speaks during a press conference after a practice round prior to the U.S. Open at Oakmont Country Club on June 15, 2016 in Oakmont, Pennsylvania. (Photo by Sam Greenwood/Getty Images)

OAKMONT, PA - JUNE 15:  Phil Mickelson of the United States speaks during a press conference after a practice round prior to the U.S. Open at Oakmont Country Club on June 15, 2016 in Oakmont, Pennsylvania.  (Photo by Sam Greenwood/Getty Images)