Jeff Pfeffer debuted on April 16, 1911, playing for the St. Louis Browns at Sportsman's Park IV; he played his final game on September 26, 1924, playing for the Pittsburgh Pirates at Forbes Field.
Big Jeff Pfeffer debuted on April 15, 1905, playing for the Chicago Cubs at West Side Park II; he played his final game on October 9, 1911, playing for the Boston Rustlers at South End Grounds III.
Jeff Pfeffer played in 6 games at pitcher for the Brooklyn Robins in 1921, starting in none of them. He made 2 putouts, had 9 assists, and committed no errors, equivalent to 0 errors per game (estimate based on total games played in). He had one double play.
Jeff Pfeffer played in 5 games at pitcher for the Brooklyn Superbas in 1913, starting in none of them. He made 2 putouts, had 6 assists, and committed no errors, equivalent to 0 errors per game (estimate based on total games played in). He had one double play.
Big Jeff Pfeffer played in 14 games at outfield for the Boston Beaneaters in 1906, starting in none of them. He made 19 putouts, had 2 assists, and committed one error, equivalent to .071 errors per game (estimate based on total games played in). He had one double play.
Monte Pfeffer debuted on September 29, 1913, playing for the Philadelphia Athletics at Shibe Park; he played his final game on September 29, 1913, playing for the Philadelphia Athletics at Shibe Park.
Jeff Abbott debuted on June 10, 1997 and played his final game on September 29, 2001.
Jeff Bailey debuted on July 6, 2007 and played his final game on July 4, 2009.
Jeff Baisley debuted on September 9, 2008 and played his final game on September 28, 2008.
Jeff Bajenaru debuted on September 4, 2004 and played his final game on August 7, 2006.
Jeff Baker debuted on April 4, 2005 and played his final game on September 27, 2013.
Jeff Baldwin debuted on May 22, 1990 and played his final game on June 4, 1990.
Jeff Ballard debuted on May 9, 1987 and played his final game on July 8, 1994.