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In this image taken from video, New York (Credit: AP)

In this image taken from video, New York Yankees' Mariano Rivera lies on the field after twisting his right knee shagging fly balls during batting practice. (May 3, 2012)

Mariano Rivera tears ACL

Yankees closer Mariano Rivera tore his ACL while shagging fly balls in the outfield at Kauffman Stadium in Kansas City. (May 4, 2012)

In this image taken from video, New York
(Credit: AP)

In this image taken from video, New York Yankees' Mariano Rivera lies on the field after twisting his right knee shagging fly balls during batting practice. (May 3, 2012)

In this image taken from video, New York
(Credit: AP Photo/YES Network)

In this image taken from video, New York Yankees' Mariano Rivera, left, lies on the field after twisting his right knee shagging fly balls during batting practice. (May 3, 2012)

In this image taken from video, Yankees pitcher
(Credit: AP Photo/YES Network)

In this image taken from video, Yankees pitcher Mariano Rivera, center, grimaces after twisting his right knee shagging fly balls during batting practice. (May 3, 2012)

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In this image taken from video, New York
(Credit: AP Photo/YES Network)

In this image taken from video, New York Yankees manager Joe Girardi, center right, helps Mariano Rivera, center, into a cart after Rivera twisted his right knee shagging fly balls during batting practice. (May 3, 2012)

In this image taken from video, Yankees manager
(Credit: AP Photo/YES Network)

In this image taken from video, Yankees manager Joe Girardi, right, helps Mariano Rivera, top center, after Rivera twisted his right knee shagging fly balls during batting practice. (May 3, 2012)

In this image taken from video, New York
(Credit: AP Photo/YES Network)

In this image taken from video, New York Yankees' Mariano Rivera, right, is being carted off the field after twisting his right knee shagging fly balls during batting practice. (May 3, 2012)

In this image taken from video, New York
(Credit: AP Photo/YES Network)

In this image taken from video, New York Yankees' Mariano Rivera is carted off the field after twisting his right knee shagging fly balls during batting practice. (May 3, 2012)

Mariano Rivera's career may be over.
(Credit: News 12 )

Mariano Rivera's career may be over.

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Yankees relief pitcher Mariano Rivera emerges from the
(Credit: John Sleezer/Kansas City Star/MCT)

Yankees relief pitcher Mariano Rivera emerges from the team's clubhouse before talking with members of the media. (May 4, 2012)

Yankees relief pitcher Mariano Rivera speaks with members
(Credit: John Sleezer/Kansas City Star/MCT)

Yankees relief pitcher Mariano Rivera speaks with members of the media before a game against the Kansas City Royals. (May 4, 2012)

Yankees relief pitcher Mariano Rivera returns to the
(Credit: John Sleezer/Kansas City Star/MCT )

Yankees relief pitcher Mariano Rivera returns to the team's clubhouse after talking with members of the media. (May 4, 2012)

Mariano Rivera is interviewed outside of the visitor's
(Credit: Getty Images)

Mariano Rivera is interviewed outside of the visitor's clubhouse. (May 4, 2012)

Mariano Rivera is interviewed outside of the visitor's
(Credit: Getty Images)

Mariano Rivera is interviewed outside of the visitor's clubhouse. (May 4, 2012)

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Mariano Rivera is interviewed outside of the visitor's
(Credit: Getty Images)

Mariano Rivera is interviewed outside of the visitor's clubhouse at Kauffman Stadium. (May 4, 2012)

Mariano Rivera #42 of the New York Yankees
(Credit: Getty)

Mariano Rivera #42 of the New York Yankees is interviewed outside of team's clubhouse at Kauffman Stadium the day after he tore an ACL while shagging balls during batting practice before a game in Kansas City. (May 4, 2012)

Yankees closer Mariano Rivera walks backs into the
(Credit: Getty Images)

Yankees closer Mariano Rivera walks backs into the team's clubhouse after a press conference at Kauffman Stadium the day after he tore an ACL while shagging balls during batting practice before a game in Kansas City. (May 4, 2012)

Yankees closer Mariano Rivera walks backs into the
(Credit: Getty)

Yankees closer Mariano Rivera walks backs into the team's clubhouse after a press conference at Kauffman Stadium the day after he tore an ACL while shagging balls during batting practice before a game in Kansas City. (May 4, 2012)

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