On October 14, Gentry was the winning pitcher in Game 3 of the World Series. Gentry hit a two-run double in this game, which was highlighted by Tommie Agee's two spectacular catches that prevented five Oriole runs. Nolan Ryan relieved Gentry in that game, pitching 2⅓ scoreless innings for the save in what would be the only World Series appearance of Ryan's 27-year career. Eight days earlier, Ryan was the winning pitcher in relief of Gentry in the final NLCS game.
Gentry pitched for the Mets for the next three seasons. He won 28 games during this period as the Mets finished third in the National League East each year.
Gentry's November 1972 trade to Atlanta was soon followed by an elbow injury. He played his last game for the Braves on May 6, 1975 and was waived two days later. Gentry was re-signed by the Mets, but was released on June 19. During his seven-year career, his pitching record was 46 wins and 49 losses.