Mariano Rivera was carted off the field with an apparent knee injury during batting practice before Thursday's game between the Yankees and Royals in Kansas City, according to news reports.
Rivera, baseball's career saves leader, apparently injured himself shagging fly balls in the outfield, but was smiling as he was carted off, according to a report by The (N.J.) Star-Ledger.
Rivera, 42, has hinted that this would be his last season. He says he's made a decision but has yet to reveal it.
Rivera is 5 for 6 in save opportunites this season with a 2.16 ERA.