Tiger: Best Player in the world, he wont have a bad tourney
Johnson: The guy is clutch, plays well on the big stage. Straight shooter would make a great partner in 2man
Barnes: He's also always around the top of the leaderboard on big events and usually gets off to a strong start quickly which the US needs
Last one is really tough but possibly Holmes. I would say Kim since he played well last year in Presidents Cup but he's been out too long. Holmes took 14th at the Open, shows he can play the links style golf game