03/04/2006 1:00AM

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Jockey Chad Murphy scored the 2,000th victory of his career at Mountaineer Race Track on Friday night when he guided Gun to a half-length victory in the fourth race. . . . Rosie Napravnik, the 18-year-old leading rider at Laurel Park, will sit out five days beginning Wednesday for careless riding aboard Valentino D'Oro on March 2.