Prendergast started his professional career at the age of 18, in the Pennsylvania State Association. He bounced around the minor leagues for a few years before pitching 1939–1941 in Southern Association. He spent the following four years serving in the United States Army.\n', '

Prendergast returned to baseball in 1946 with the Syracuse Chiefs of the International League; in 1947, he had the best season of his career, going 20–15 with a 3.08 earned run average. Prendergast joined the Braves in early 1948. However, he did not pitch well and was released in mid-season. He compiled a major league record of 1–1, with a 10.26 earned run average and 3 strikeouts in 16⅔ innings pitched.\n', '

Prendergast\'s pitching declined after 1948. In 1951, he sued Major League Baseball for $150,000 to test the legality of the reserve clause. He never played professionally again.\n', '

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