Left-handed pitcher Blaine Beatty was acquired from the Baltimore Orioles on December 8, 1987 in exchange for reliever Doug Sisk. He spent the next two seasons pitching in the minors before finally making his Major League debut on September 16, 1989; he pitched an inning of scoreless relief. Beatty made 1 more appearance with the Mets as their starting pitcher on September 30; he lasted 5 innings and gave up 1 run and 4 hits. The Mets won the game 7-2 over the Pirates but Beatty was credited with a no-decision.
Beatty missed the entire 1990 season with an elbow injury. He returned in 1991 and once again pitched in the minors before getting the call to join the Mets in September. He appeared in 5 games all out of the bullpen and posted a 2.79 ERA in 9 2/3 innings.
Following the season the Mets traded Beatty to the Montréal Expos in exchange for Jeff Barry. In 7 games for the Mets over 2 seasons Beatty posted a 0-0 record with a 2.30 ERA.
While with the Mets Beatty wore number 38.