From BR Bullpen
James Percy Mason
- Bats Left, Throws Right
- Height 6' 2", Weight 190 lb.
- School University of South Alabama
- High School Murphy High School
- Debut September 26, 1971
- Final Game September 24, 1979
- Born August 14, 1950 in Mobile, AL USA
 Biographical Information
Jim Mason was the first player to hit a home run in the only World Series plate appearance of his career, in the 1976 World Series. There have since been two others: Geoff Blum in 2005, and Bobby Kielty in 2007. He was also the first player to hit a home run in the only postseason plate appearance of his career; Tom Wilson joined him in 2004. Combining these, Mason is the only player whose only postseason plate appearance resulted in a World Series home run.
Because of Mason's low batting average, which hovered just over .200, his name (along with Leo Dixon's) was proposed for inclusion in a new term for poor hitting called the "Mason-Dixon Line" (.204), which is closer to .200 than the Mendoza Line (.215).
 Records Held
- Tied MLB record by hitting four doubles in a game, July 8, 1974
- Brandon Gavett & Lee Ashendorf (May 2003). The Fans Speak Out: Letters to the Editor. Baseball Digest. Retrieved on April 19, 2012.