He debuted with the Mets in April 1964 as a reliever against his old Pirates team. Roberto Clemente greeted him with a two run triple, although he did not take the loss. In his first start in May the St. Louis Cardinals tagged him for four runs by the third inning, that time he did earn his first loss.
Hinsley would never make it to the big leagues again, pitching in the Mets & then the Cleveland Indians organization through 1971. Lifetime he was 0-2 with a 7.08 ERA with 14 strike outs 11 walks in eleven appearances.