It was apparently a “freak accident” that led to Mariano Rivera’s injury during the Yankees Old Timer’s Day game, Andy Pettitte said during an appearance on WFAN on Saturday. At the

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 center field behind second base.

Rivera was locked in and laced a ground ball through the infield and into left for a single. The base hit moved Posada to second and put a big smile on Rivera's face as he rounded first base and laughed with Pettitte while getting some praise from Johnny Damon.