J. A. Happ debuted on June 30, 2007, playing for the Philadelphia Phillies at Citizens Bank Park; he played his final game on September 28, 2013, playing for the Toronto Blue Jays at Rogers Centre.
John Happenny debuted on July 2, 1923, playing for the Chicago White Sox at Comiskey Park; he played his final game on October 6, 1923, playing for the Chicago White Sox at Comiskey Park.
John Burke debuted on June 27, 1902 and played his final game on July 15, 1902.
John Burkett debuted on September 15, 1987 and played his final game on September 26, 2003.
John Cassidy debuted on April 24, 1875 and played his final game on August 12, 1885.
John Cerutti debuted on September 1, 1985 and played his final game on October 5, 1991.
John Crowley debuted on May 1, 1884 and played his final game on September 10, 1884.
John kennedy aug. 1957,
John Cumberland debuted on September 27, 1968 and played his final game on July 27, 1974.
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.
John Antonelli debuted on September 16, 1944 and played his final game on September 17, 1945.
John Atz debuted on September 24, 1902 and played his final game on September 30, 1909.
John Axford debuted on September 15, 2009 and played his final game on September 28, 2013.
John Balaz debuted on September 10, 1974 and played his final game on September 28, 1975.