Serena in, Sharapova out at Indian Wells; Federer, Nadal win

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INDIAN WELLS, Calif. — Struggling with her serve and a rash of errors, Serena Williams overcame a slow start to beat Sloane Stephens 6-7 (3), 6-2, 6-2 in the fourth round at the BNP Paribas Open on Tuesday, extending her