A's Vimael Machin 'honored' to wear No. 21 on Roberto Clemente Day
Here's why it would be a bad idea for MLB to retire Roberto Clemente's No. 21
ESPN: MLB to allow Pirates, Puerto Rican players, award nominees to wear No. 21 on Roberto Clemente Day
Puerto Rican MLB players can wear number 21 on Clemente Day
Report: Puerto Rican MLB Players Allowed to Wear No. 21 on Roberto Clemente Day, News, Scores, Highlights, Stats, and Rumors
For Many Latino Players, Roberto Clemente's Number Is Off Limits, Too - The New York Times
Puerto Rican Twins don No. 21 in tribute to Roberto Clemente – Twin Cities
Puerto Rican players follow Pirates' push to wear No. 21, celebrate Roberto Clemente
All Puerto Rican Players Can Wear No. 21 On Roberto Clemente Day - CBS Pittsburgh
All Pirates Wearing #21, Rest of MLB Wears Patches in Honour of Roberto Clemente – SportsLogos.Net News