[1] A native of Somerset, Pennsylvania, Margoneri was signed by the New York Giants in 1950, but he saw his baseball career interrupted by a stint in the Army.

[2] After being discharged from military service, Margoneri pitched for the Navegantes del Magallanes club of the Venezuelan Winter League, and was responsible for the only defeat suffered by the Puerto Rican Cangrejeros de Santurce champion team, 7–2, in the closing game of the 1955 Caribbean Series.

Margoneri pitched a complete game against a lineup that included future Hall of Famers Roberto Clemente and Willie Mays, as well as Harry Chiti, Buster Clarkson, George Crowe, Luis Olmo and Don Zimmer.

In 1956 he had a 6–6 record with a 3.93 earned run average in a pitching rotation that included Johnny Antonelli (20–13), Rubén Gómez (7–17), Al Worthington (7–14) and Jim Hearn (5–11).

[1] In a two-season major league career, Margoneri posted a 7–7 record with a 4.29 ERA in 36 pitching appearances, including 15 starts and three complete games, giving up 60 earned runs on 132 hits and 70 walks while striking out 67 in 126 innings of work.