NEW YORK, NY - OCTOBER 30: The 2015 Roberto Clemente Award trophy is seen prior to Game Three of the 2015 World Series between the New York Mets and the Kansas City Royals at Citi Field on October 30, 2015 in New York City. (Photo by Mike Stobe/Getty Images)
With 21 days to go until Opening Day, we look back at two great careers wearing the number 21 jersey for the Mariners. On top of that, let’s look at the greatest player to wear the number 21 jersey and the movement for no one to ever wear the number again in baseball.