Listed at 6 feet 1 inch (1.85 m) and 175 pounds (79 kg), Duffalo entered the professional ranks as a member of the Pittsburgh Pirates\' farm system in 1955, winning 17 games as a rookie in the Class D Georgia–Florida League in 1955, then another 16 games in the Class B Carolina League the following season. But the Pirates sent him to the Giants during the 1958 season.\n', '

Duffalo made his Major League debut on April 12, 1961 for the Giants in a 2–1 win over the Pirates at Candlestick Park. He entered the game with two on and two outs in the ninth inning against Roberto Clemente, who grounded out to end the game, and Duffalo was credited with a save. His best years were in 1963 and 1964; in 1963 he pitched 34 games with a 4–2 record and a 2.87 earned run average, followed in 1964 with 35 games and a 5–1 record with a 2.92 ERA. Duffalo would play 119 of his 141 Major League games for the San Francisco Giants.\n', '

He was traded to the Cincinnati Reds for left-handed relief specialist Bill Henry on May 4, 1965. In 22 games he was 0–0 with a 3.45 ERA in what would be his last Major League season. However, he spent another seven seasons in minor league baseball before his retirement in 1972 at age 36.\n', '

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