On June 29, 1967, the Mets purchased the contract of right-handed pitcher Hal Reniff from their cross-town rivals the New York Yankees. He made his Mets debut on July 1 and earned the win by pitching the final 3 innings of the 6-4 victory over the St Louis Cardinals. Reniff also earned the victory the following day in his second appearance with the Mets. Overall Reniff appeared in 29 games during the 1967 season, all out of the bullpen, and posted a 3-3 record with 4 saves and a 3.35 ERA.
Following the season, the Mets released Reniff, he returned to the Yankee organization but never made it back to the majors. He pitched 4 more seasons in their minor-league system before retiring.
While with the Mets Reniff wore number 32.
Hal Reniff also played for the New York Yankees from 1961-1967.