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 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.
Jordy Mercer is a short stop for the Pittsburgh Pirates.
John kennedy aug. 1957,
John Abadie debuted on April 26, 1875 and played his final game on June 10, 1875.
John Ake debuted on May 12, 1884 and played his final game on July 15, 1884.
John Allen debuted on June 2, 1914 and played his final game on June 2, 1914.
John Anderson debuted on September 8, 1894 and played his final game on October 2, 1908.
John Andre debuted on April 16, 1955 and played his final game on July 16, 1955.
John Andrews debuted on April 8, 1973 and played his final game on September 19, 1973.