Sullivan began the 1941 season with the Braves, but was sold to the Pittsburgh Pirates in June. During the complete season, he appeared in 32 games, six as a starter, and compiled a 6–3 record with a 3.63 ERA. In the last half of the season, he went 4–1 with a 2.97 ERA for the Pirates. Despite having his first winning record and his lowest ERA, Sullivan never played another game in the major leagues.
