Why are MLB players wearing 21? Tributes around the league for Pirates legend explained
Pirates will honor Roberto Clemente by wearing his No. 21 on their jerseys - ESPN
Altoona Curve honors Pirates legend Roberto Clemente, retires No. 21
Let's Talk Sports: Who is identified by a uniform number?
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Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News
ESPN: MLB to allow Pirates, Puerto Rican players, award nominees to wear No. 21 on Roberto Clemente Day
To Pirates catcher Michael Perez, wearing No. 21 'very special
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The best celebrations of the 2023 MLB season, so far
Uniform number (Major League Baseball) - Wikipedia
MLB's Puerto Rican-born players honor Roberto Clemente by wearing 21
Blue Jays retire Roy Halladay's No. 32 before Opening Day game vs. Yankees – New York Daily News
MLB Let Players Pick a Crazy Nickname to Wear. Their Choices Were Dull. - WSJ
