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!GULLANE, SCOTLAND - JULY 18: Phil Mickelson of the United States walks down the 14th hole with Rory McIlroy of Northern Ireland during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Richard Heathcote/R&A/R&A via Getty Images)

Phil Mickelson of the United States walks down the 14th hole with Rory McIlroy of Northern Ireland during the first round of the 142nd Open Championship at Muirfield on July 18, 2013 in Gullane, Scotland. (Photo by Richard Heathcote/R&A/R&A via Getty Images)