Originally written on Fox Sports  |  Last updated 5/9/13

SAN FRANCISCO - OCTOBER 10: USA Team Captain Fred Couples watches the play during the Day Three Morning Foursome Matches of The Presidents Cup at Harding Park Golf Course on October 10, 2009 in San Francisco, California. (Photo by Scott Halleran/Getty Images)
Roberto Castro made his debut in The Players Championship by joining Fred Couples and Greg Norman in the record book. Castro did everything right on a gorgeous Thursday at the TPC Sawgrass and had a 9-under 63 to tie the course record. He missed a birdie putt from just outside 12 feet. For someone who had never played the Stadium Course, Castro made it look easy. His 9-iron onto the island green at the 17th settled a foot away, and he hit a 4-iron to a foot on the 18th. Morning conditions were ideal for scoring, with several players taking advantage. Hunter Mahan had a 67. Rory McIlroy, who had never broken par in three previous times playing this event, was 6 under with three holes to play.
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