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

Oakland A's: Happy Roberto Clemente Day! - Athletics Nation

Hot take: Roberto Clemente Day should be just like Jackie Robinson Day💯⚾️ : r/mlb

Reds 5, Mets 3—Comeback spoiled on Roberto Clemente Day - Amazin' Avenue

All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News

MLB honors Roberto Clemente in 21st annual event

Shutdown hampers Astros' pursuit of individual milestones

Some MLB Players Wearing #21, All Wearing 21 Patches Today for Roberto Clemente Day – SportsLogos.Net News

How Tanner Houck Feels About Roberto Clemente Award Nomination

Roberto Clemente facts most don't know: Part 2–Dr. Martin Luther King, Jr. and Vic Power – mlbblogger

Marley Rivera] Beginning today, all eight active Roberto Clemente Award winners will wear a No.21 on the back of their caps. This includes Nelson Cruz, Yadier Molina, Adam Wainwright, Albert Pujols, Carlos

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

Pittsburgh Pirates each don No. 21 to honor Roberto Clemente - ESPN

Díaz homers in 7th to break tie, Astros beat A's 5-2

MLB - For No. 21. #ClementeDay

Don Nottebart - Wikipedia