Although Teufel had hit far better against right-handed pitchers in 1985, he was used mainly against left-handed pitchers in a platoon system with New York. Splitting time with Wally Backman, Teufel started quickly in with a go-ahead 14th inning single in his first game with the Mets (although they lost in the bottom half of the inning). His average stayed around .220 into June. On June 10, Teufel had one of the most exciting moments in the Mets championship season with a walk-off pinch-hit grand slam in the bottom of the 11th inning against the Philadelphia Phillies.