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San Francisco Giants v New York Yankees

NEW YORK, NY - SEPTEMBER 22: Mariano Rivera #42 of the New York Yankees stands with Metallica, and a customized amplifier given to him by the band, during the Mariano Rivera Day pregame ceremony on September 22, 2013 at Yankee Stadium in the Bronx borough of New York City. (Photo by Maddie Meyer/Getty Images)

Yankees honor Mariano Rivera

The Yankees will honor Mariano Rivera, who is baseball's all-time saves leader with 652 career saves (and counting) today. Mo's number 42 has been painted onto the field and a number of ex-Yankees are expected to be in attendance, from Reggie Jackson to Bernie Williams.

The Yankees will also be wearing caps with a special patch to honor Rivera. According to cap-maker New Era, this is the first time an MLB team will be honoring an active player on its cap.