Right-handed pitcher Mark Corey was acquired from the Cincinnati Reds on February 4, 1999 in exchange for infielder Ralph Milliard. He made his Major League debut on October 2, 2001, in just one inning of work he allowed 3 runs and 4 hits. Corey made one more appearance three days later with better results; he allowed no runs in 2/3 of an inning.
Corey started the 2002 season in the minors before getting the call to join the big club in the middle of May. He made his 2002 debut on May 13 against the Los Angeles Dodgers and suffered the loss by giving up the winning run in the bottom of the 13th inning. Following the game, he was shipped back to the minors only to return a month later. He remained with the Mets before being traded to the Colorado Rockies at the trading deadline along with Jay Payton and Robert Stratton for John Thomson and Mark Little. With the Mets in 2002 Corey appeared in 12 games and posted a 0-3 record with 4.50 ERA.
In 14 appearances for the Mets over two seasons Mark Corey went 0-3 with a 6.17 ERA in 11 2/3 innings.
While with the Mets Corey wore number 27.
Mark Corey also played for the following teams:
Colorado Rockies – 2002
Pittsburgh Pirates – 2003,2004