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Phil Mickelson birdied the 18th hole Saturday to cap off a six-under 66. Mickelson will try to win his fourth green jacket on Sunday.
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Mickelson eagled the par-5 13th on his way to a back-nine 30.
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Mickelson has birdied the 18th hole all three days.
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Mickelson gave a lucky fan a souvenir on the 15th hole.
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Peter Hanson birdied 17 and 18 for a seven-under 65 and a one-shot lead over Mickelson heading into the final round.
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Louis Oosthuizen, who won the 2010 British Open at St. Andrews, is only two shots back.
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Bubba Watson birdied 18 for a two-under 70.
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Rory McIlroy fell out of contention with a five-over 77.
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Sergio Garcia made six bogeys and three birdies for a three-over 75.
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McIlroy, right, and Garcia jokingly shared a hug after each made birdie on the par-3 12th.
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Lee Westwood still has a shot at his first major despite a 72 on Saturday.
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Matt Kuchar is four shots back after a two-under 70.
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Fred Couples started the day tied for the lead, but he tumbled down the leaderboard after a 75.
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Tiger Woods failed to make a move on Saturday. He finished with a 72.
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Jason Dufner bogeyed 17 and 18 for a 75.
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Brandt Snedeker made five birdies and a bogey for a 68.