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Rory McIlroy grabbed the early clubhouse lead with a 7-under 65.
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Rickie Fowler birdied four of the last five holes to shoot a 2-under 70.
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Matt Kuchar continued his stellar play, opening with a solid 68.
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Retief Goosen started strong with an eagle on the par-4 first hole, but he closed with three straight bogeys for a 70.
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Tiger Woods made three birdies and two bogeys for a 1-under 71.
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Ross Fisher opened with a 3-under 69.
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Martin Kaymer is off to a dismal start. The world No. 1 shot a 6-over 78.
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Ernie Els started off well on the front nine, but he stumbled to a 4-over 40 on the back to finish with a 75.
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Nick Watney made four birdies and four bogeys in the first round.
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Dustin Johnson made six bogeys and four birdies for a 2-over 74.
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Camilo Villegas has yet to finish inside the top 30 in a tournament this season, but he opened with a 2-under 70.
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Arnold Palmer hit the ceremonial first tee shot on Thursday.
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Jack Nicklaus congratulated Palmer after the shot.
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Nicklaus also put his in the fairway.
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Nicklaus urged his ball past Palmer's. He outdrove him by a bit.