Born in The Bronx, New York, Zanni was signed by his home team New York Giants as an amateur free agent before the 1951 season. Over the following seasons, Zanni moved up the minor league baseball ranks. On June 5, 1954, Zanni pitched a no-hitter for the Sioux City Cowboys of the Western League. In 1956, Zanni was a spring training roster invitee, but was sent back to the minors before the season started. He spent the following seasons with the Louisville Colonels and the Phoenix Giants, and helped lead the Giants to the Pacific Coast League championship in 1958.\n', '

This led to his Major League debut on September 28. He faced the St. Louis Cardinals, pitching four innings and allowing one run, earning the victory as the Giants won 7–2.\n', '

Zanni spent the offseason in the Dominican League, then was back on the Giants\' roster for the 1959 season. During the season, he pitched in 11 innings in nine games, striking out 11. After playing nine games and having an earned run average (ERA) of 6.55, he was sent back to Phoenix. Zanni spent the rest of the 1959 and 1960 seasons with the Tacoma Giants (formerly the Phoenix Giants), then spent the 1960 offseason in the Puerto Rican League, earning an ERA of 2.73 with six victories and no losses. After spending part of the 1961 season with Tacoma, where Zanni had a 2.65 ERA and an 8–4 record, he was called up to the San Francisco Giants\' Major League roster on July 22, 1961. He went on to pitch eight games during the 1961 San Francisco Giants season, winning a game and posting an ERA of 3.75. After the season ended, on November 30 Zanni was traded along with player to be named later (Verle Tiefenthaler), Bob Farley, and Eddie Fisher to the Chicago White Sox for Billy Pierce and Don Larsen.\n', '

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