Houston Astros: 8 players don No. 21 on Roberto Clemente Day

Roberto Clemente's No. 21 is 'retired in our hearts' but not on most MLB rosters - The Athletic

MLB allows more players to wear No. 21 to honor Roberto Clemente – NBC Sports Chicago

Twins balance playoff push, keeping players fresh and healthy for October – Twin Cities

Houston Astros: 8 players don No. 21 on Roberto Clemente Day

October 1, 1967: Roberto Clemente 'manages' Pirates in season finale and wins fourth NL batting crown – Society for American Baseball Research

Witt, Velázquez and Massey each homer for KC Royals in victory over Houston Astros

Roberto Clemente: Baseball Rebel – Society for American Baseball Research

50 years ago: Roberto Clemente dies in plane crash

Yankees help pay tribute to former Pirates great Roberto Clemente - Newsday

How Tanner Houck Feels About Roberto Clemente Award Nomination

Javier Baez uncertain he will be a long-term Met

MLB All-Decade Team -- Who made our squad of baseball's best from 2010-2019? - ESPN