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was on the course Tuesday morning, trying to get a feel for Congressional's newly refurbished Blue Course.
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Paul Childs/Action Images/ZUMAPRESS.com
has struggled with his game in 2011.
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is only 18 but has already won twice on the European Tour.
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will try to back up his ranking with a major victory.
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As always, Mickelson spent time greeting fans and signing autographs.
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looks to become the first Japanese major champion this week.
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is the reigning PGA champion and one of only three players in the top 10 who have won a major championship.
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had a three-shot lead heading into the final round at last year's Open, but quickly gave it up, eventually losing to Graeme McDowell.
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Mickelson is looking to win his first U.S. Open. He has finished second five times, more than any player in history.
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could go a long way to reclaiming the No. 1 ranking with a win this week.