Borje Salming wore number 21 for the Toronto Mapleleafs. However, he left the team in 1989 and his number 21 was taken by a future NHL star named Sean McKenna.
He wore #21.
Rafael wore jersey number 21 for mancunian republic in 2010-2011.
He wore #21.
According to Baseball Almanac, no one on the 1995 White Sox roster wore #21.
Roberto Clemente wore uniform number 13, and 21 during his first year in 1955 with the Pittsburgh Pirates, and wore uniform number 21 the rest of his career from 1956 -1972.
In 1980, running back Clark Gaines wore #21 for the New York Jets.
From what I've researched, no one wore number 21 for the San Diego Chargers in 1998.
Pac Man Jones wore # 21 in 2008.
Eric Wright currently wears the #21 jersey.
Roger Clemens wore number 21.
Roberto Clemente
Roberto Clemente