21 Ryan Sweeney is the 2010 wearer.
Info found at: Oakland Athletics - Wikipedia, the free encyclopedia
Stephen Vogt is number 21 on the Oakland Athletics.
John Briscoe debuted on April 18, 1991, playing for the Oakland Athletics at Oakland Coliseum; he played his final game on May 21, 1996, playing for the Oakland Athletics at Oakland Coliseum.
Kirk Dressendorfer debuted on April 13, 1991, playing for the Oakland Athletics at Oakland Coliseum; he played his final game on May 21, 1991, playing for the Oakland Athletics at Oakland Coliseum.
Wayne Gross debuted on August 21, 1976, playing for the Oakland Athletics at Oakland Coliseum; he played his final game on October 1, 1986, playing for the Oakland Athletics at Oakland Coliseum.
Rich Harden debuted on July 21, 2003, playing for the Oakland Athletics at Oakland Coliseum; he played his final game on September 25, 2011, playing for the Oakland Athletics at Oakland-Alameda Country Coliseum.
Pedro Figueroa debuted on April 21, 2012, playing for the Oakland Athletics at O.co Coliseum; he played his final game on September 29, 2013, playing for the Oakland Athletics at O.co Coliseum.
Derek Norris debuted on June 21, 2012, playing for the Oakland Athletics at O.co Coliseum; he played his final game on September 29, 2013, playing for the Oakland Athletics at O.co Coliseum.
Tony Pierce debuted on April 14, 1967, playing for the Kansas City Athletics at Municipal Stadium I; he played his final game on June 21, 1968, playing for the Oakland Athletics at Oakland Coliseum.
Sunday Night Baseball - 1990 Anaheim Angels vs- Oakland Athletics 13-4 was released on: USA: 21 April 2002
Dave Stewart of the Oakland Athletics had 20 wins in 1987, 21 in 1988, and 21 in 1989.
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Charlie Sands debuted on June 21, 1967, playing for the at ; he played his final game on May 8, 1975, playing for the Oakland Athletics at Oakland Coliseum.