NEW YORK — Hall of Famer Mariano Rivera tore an Achilles tendon while going after a flyball at the New York Yankees’ Old-Timers’ Day game on Saturday and needs surgery. Agent Fern Cuza said the 55-year-old closer, baseball’s career leader in saves, will have the operation within a week. In his lone at-bat, Rivera singled off former teammate Andy Pettitte and easily ran to first base. During an at-bat by Willie Randolph, Rivera took a step and fell to the ground in shallow cent

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