Margoneri pitched in 36 games for the New York Giants in 1956-1957. He went 7-7 with a 4.29 ERA while striking out 67 hitters in 126 innings. His best season was his first, as he was 6-6 with a 3.93 ERA in 1956. He made 13 starts that year for New York and threw two complete games. His professional career stretched from 1950-1960, although he missed two years while he was in the army.
On August 4, 1956 Margoneri led off the third inning with a home run off Chicago Cub Warren Hacker during their game at the Polo Grounds in New York. It would prove to be a big blow in the Giants 3-2 win. Margoneri pitched seven innings in the game, allowing just two runs. However, he did not get the win as the game was tied when he exited in the seventh. New York scored one in the ninth off Hacker to get the victory. Hoyt Wilhelm got the win for the Giants.
Joe Margoneri – career stats