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GETTING SERVED

Singer Jesse McCartney keeps the ball in his court Saturday during Arthur Ashe Kids’ Day in Flushing, N.Y., where he performed with the Click Five and Rihanna to celebrate the start of the U.S. Open. But he lost his balance when he turned his attention to blonde tennis hottie Anna Kournikova. "I went up to her and was at a loss for words,” he says.