A native New Yorker, Ken Singleton was drafted by the Mets with the third overall pick in the 1967 free agent draft. After working his way through the Mets minor league system Singleton made his major league debut on June 24, 1970, he went 0-4 as the Mets starting leftfielder. He finished out the season as a regular member of the Mets outfield and hit .263 with 5 home runs and 26 RBIs.
Singleton spent the entire 1971 season with the Mets as their regular right fielder. His average dipped to .245 but he still managed to hit 13 home runs with 46 RBIs. On the final day of the season Singleton hit two home runs against the St Louis Cardinals. It turned out to be his last appearance in a Mets uniform. Following the season the Mets traded Singleton to the Montreal Expos along with Tim Foli and Mike Jorgensen in exchange for Rusty Staub.
In 1 ½ seasons with the Mets Ken Singleton appeared in 184 games hit .252 with 18 home runs and 72 RBIs.