By Sam Weinman
Golf Digest

It's not golfers named Phil, Ernie or Rory who have given Tiger Woods the majority of his major battles, but more a collection of unheralded players. Five years after Woods' classic U.S. Open duel with Rocco Mediate, don't be surprised if the guy who stands in Woods' way at Merion is a guy you've never heard of.

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Follow Sam Weinman on Twitter @SamWeinman.

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