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HUMBLE, TX - APRIL 02: Phil Mickelson hits his tee shot on the ninth hole during the first round of the Shell Houston Open at the Golf Club of Houston on April 2, 2015 in Humble, Texas. (Photo by Scott Halleran/Getty Images)

HUMBLE, TX - APRIL 02:  Phil Mickelson hits his tee shot on the ninth hole during the first round of the Shell Houston Open at the Golf Club of Houston on April 2, 2015 in Humble, Texas.  (Photo by Scott Halleran/Getty Images)