Jack Mercer debuted on August 2, 1910, playing for the Pittsburgh Pirates at Forbes Field; he played his final game on August 2, 1910, playing for the Pittsburgh Pirates at Forbes Field.
Jordy Mercer debuted on May 29, 2012, playing for the Pittsburgh Pirates at PNC Park; he played his final game on September 29, 2013, playing for the Pittsburgh Pirates at PNC Park.
Mark Mercer debuted on September 1, 1981, playing for the Texas Rangers at Arlington Stadium; he played his final game on September 28, 1981, playing for the Texas Rangers at Arlington Stadium.
Win Mercer debuted on April 21, 1894, playing for the Washington Senators at Boundary Field; he played his final game on September 27, 1902, playing for the Detroit Tigers at Bennett Park.
John Mercer debuted on June 25, 1912, playing for the St. Louis Cardinals at Robison Field; he played his final game on June 25, 1912, playing for the St. Louis Cardinals at Robison Field.
Jack Aker debuted on May 3, 1964 and played his final game on September 27, 1974.
Jack Albright debuted on May 19, 1947 and played his final game on July 27, 1947.
Jack Allen debuted on May 1, 1879 and played his final game on July 17, 1879.
Jack Aragon debuted on August 13, 1941 and played his final game on August 13, 1941.
Jack Baker debuted on September 11, 1976 and played his final game on June 8, 1977.
Jack Baldschun debuted on April 28, 1961 and played his final game on August 21, 1970.
Jack Banta debuted on September 18, 1947 and played his final game on June 21, 1950.
Jack Barry debuted on July 13, 1908 and played his final game on June 23, 1919.