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In this image taken from video, New York Yankees manager Joe Girardi, right, helps Mariano Rivera, top center, after Rivera twisted his right knee shagging fly balls during batting practice before a baseball game with the Kansas City Royals, Thursday, May 3, 2012, in Kansas City, Mo. The Yankees closer was carted off the field and sent for further tests. (AP Photo/YES Network) MANDATORY CREDIT

Yanks' Rivera suffers injury

New York Yankees closer Mariano Rivera was carted off the field and taken for tests after twisting his right knee shagging flyballs during batting practice May 3.