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DUBLIN, OH - MAY 29: Jordan Spieth (L) and Phil Mickelson walk off the second tee during the first round of the Memorial Tournament presented by Nationwide Insurance at Muirfield Village Golf Club on May 29, 2014 in Dublin, Ohio. (Photo by Matt Sullivan/Getty Images)

DUBLIN, OH - MAY 29:  Jordan Spieth (L) and  Phil Mickelson walk off the second tee during the first round of the Memorial Tournament presented by Nationwide Insurance at Muirfield Village Golf Club on May 29, 2014 in Dublin, Ohio.  (Photo by Matt Sullivan/Getty Images)