Corcoran signed with the Montreal Expos on June 21, 2001, as an amateur free agent. After starting the 2003 season at Single-A, Corcoran advanced through Double-A and made two appearances in Triple-A before making his major league debut on July 30. He spent the next three years in the minors with the Expos and stayed with them after they became the Washington Nationals. Corcoran appeared in a few games in the 2004 and 2006 seasons.\n', '

Corcoran was granted free agency after 2006, and signed a minor league contract with the Florida Marlins on January 4, 2007. Corcoran spent all of the 2007 season with the Marlins Triple-A affiliate, the Albuquerque Isotopes, becoming a free agent at the end of the season.\n', '

On November 21, 2007, the Seattle Mariners signed Corcoran to a minor league contract and invited him to spring training. Corcoran had a career-best year in 2008. In 50 appearances, he had a 6-3 record, 3.22 ERA, and 39 strikeouts.\n', '

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