(CBS SF) – New York Yankees reliever Mariano Rivera plans to announce Saturday that he will retire after the 2013 season.

The 43-year-old closer is baseball’s saves leader with 608 and is regarded as one of the best clutch pitchers in history, posting a record 42 postseason saves with an 0.70 ERA while helping the Yankees win five World Series championships.

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Coach Madden told the KCBS Morning Crew it’s not much of a surprise.

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“The constants have always been Rivera and (Derek) Jeter,” he said of the Yankees roster. “And now you see Rivera going.”

“And maybe it started, maybe getting close to the end started for both of them with their injuries last year. There was some question whether Rivera would even come back this year, that that may have been it for him.”

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