In 2003, the Mets signed Tom Glavine as a free agent while also signing his younger brother Mike. The only difference between the two was that Tom was a former Cy Young Award winner while Mike was a career minor leaguer. Mike stayed true to his form and spent the entire season in Triple A with the Norfolk Tides, before the Mets recalled him in September to play with his brother.
Mike Glavine made his Major League debut on September 14th when he pinch hit for his brother. Mike grounded out to 2nd base, but by appearing in the game the Glavine became the first brothers to play for the Mets. Mike Glavine would go on to appear in six games for the Mets as both a pinch hitter and first baseman. He went 1 for 7 at the plate with his only hit coming in his final at bat of the season against the Florida Marlins. He returned to play for the Norfolk Tides in 2004 but hit just .216 and retired from playing following the season.
While with the Mets Glavine wore number 27.