Sean Gallagher debuted on June 9, 2007, playing for the Chicago Cubs at Wrigley Field; he played his final game on October 3, 2010, playing for the Pittsburgh Pirates at PNC Park.
Sean Gallagher played in 8 games at pitcher for the Chicago Cubs in 2007, starting in none of them. He played for a total of 44 outs, equivalent to 1.63 9-inning games. He made no putouts, had one assist, and committed no errors, equivalent to 0 errors per 9-inning game. He had one double play.
Sean Gallagher played in 12 games at pitcher for the Chicago Cubs in 2008, starting in 10 of them. He played for a total of 176 outs, equivalent to 6.52 9-inning games. He made 5 putouts, had 7 assists, and committed one error, equivalent to .153 errors per 9-inning game. He had one double play.
Sean Gallagher played in 11 games at pitcher for the Oakland Athletics in 2008, starting in all of them. He played for a total of 170 outs, equivalent to 6.3 9-inning games. He made 3 putouts, had 6 assists, and committed no errors, equivalent to 0 errors per 9-inning game. He had one double play.
John Gallagher debuted on August 20, 1915, playing for the Baltimore Terrapins at ; he played his final game on October 3, 1915, playing for the Baltimore Terrapins at .
Sean Barker debuted on June 6, 2007 and played his final game on June 15, 2007.
Sean Bergman debuted on July 7, 1993 and played his final game on June 17, 2000.
Sean Burnett debuted on May 30, 2004 and played his final game on May 26, 2013.
Sean Casey debuted on September 12, 1997 and played his final game on September 28, 2008.
Sean DePaula debuted on August 31, 1999 and played his final game on August 1, 2002.
Sean Doolittle debuted on June 5, 2012 and played his final game on September 27, 2013.
Sean Douglass debuted on July 18, 2001 and played his final game on September 28, 2005.
Bob Gallagher debuted on May 17, 1972, playing for the at ; he played his final game on September 26, 1975, playing for the New York Mets at Shea Stadium.