48. Bill Swift

The 1930s National League is often remembered for its powerful offenses, but surviving that era's run-heavy style needed pitchers who could avoid giving up free passes. Bill Swift was the steady pitcher for the Pittsburgh Pirates—a versatile, control-focused thrower who pioneered the modern "swingman" role before it was named. Debuting in 1932, the Pennsylvania native lacked overwhelming stuff but had unshakeable strike zone control. By refusing to grant free passes, Swift became manager Pie Traynor's safety net, pitching whenever needed.

His debut campaign in 1932 immediately demonstrated his precise control. As a 24-year-old rookie entering the major leagues, Swift made consistent, efficient pitching a hallmark of his season, posting a 14–10 record over 194.2 innings. He consistently shut down opposing hitters by limiting walks and forcing them to make contact, finishing the season with the lowest walks per nine innings in the National League at just 1.1 (BB/9).

Although he never secured a permanent spot in the starting rotation, his versatility made him a reliable workhorse. During his first five summers in Pittsburgh, Swift compiled a 70–57 record and consistently crossed the 200-inning mark each year by easily switching between high-leverage starting roles and multi-inning relief duties.

As natural physical deterioration increased into the late 1930s, the coaching staff officially marked a transition by moving the veteran permanently to the bullpen. Despite a reduced role, Swift's consistent low-variance control remained a valuable asset throughout the 1939 season, aiding in maintaining leads and supporting a changing pitching staff.

Beyond relying on his skill with the rubber, Swift demonstrated a highly proficient approach at the batter's box, often saving the weaker Pittsburgh lineup. He was well regarded as one of the top-hitting pitchers of his era, with 132 hits and a solid .230 batting average during his time with the Pirates.

The organization dealt Swift to Boston after the 1939 season.  In Pittsburgh, Swift had a 91–79 record, 71 complete games, seven shutouts, and a 3.57 ERA across 1,489 innings pitched.