2001 Mariano Rivera Autographed World Series First Pitch Baseball Signed JSA MLBMariano Rivera signed 2001 World Series ceremonial first pitch baseball. Signed beautifully on the sweet spot with US Flag emblem on one panel of the baseball denoting that it is a ceremonial first pitch ball. Letter of Authenticity provided by JSA, certification #D22589 Rivera played 19 seasons in Major League Baseball for the New York Yankees, from 1995 to 2013. A 13 All Star and 5 time World Series champion, Rivera is MLB's career leader in saves