John Tudor was an American professional baseball player who had a successful career as a left-handed pitcher in Major League Baseball (MLB). He played for several teams, including the Boston Red Sox, Pittsburgh Pirates, Los Angeles Dodgers, and St. Louis Cardinals.

Tudor began his MLB career with the Boston Red Sox in 1979. He spent four seasons with the Red Sox, where he established himself as a reliable starting pitcher. However, his time with the Red Sox was marked by inconsistency, and he was traded to the Pittsburgh Pirates in 1984.

His stint with the Pirates was short-lived, and he was traded to the St. Louis Cardinals later that year. It was with the Cardinals that Tudor had his most successful seasons. In 1985, he had an exceptional season, finishing with a record of 21-8, a 1.93 ERA, and ten shutouts. This performance earned him a second-place finish in the Cy Young Award voting. Tudor's performance was instrumental in leading the Cardinals to the World Series that year, although they ultimately lost to the Kansas City Royals.

Tudor continued to perform well for the Cardinals until 1988 when he was traded to the Los Angeles Dodgers. He helped the Dodgers win the World Series in 1988, although he was not a significant contributor due to injuries.

In 1989, Tudor returned to the Cardinals, where he finished his career. He retired in 1990 due to persistent injuries. Despite his injury issues, Tudor was known for his control and precision as a pitcher. He was not a power pitcher, but he was effective at keeping hitters off balance and inducing weak contact.

Throughout his career, Tudor had a win-loss record of 117-72, a 3.12 ERA, and 988 strikeouts. He was known for his calm demeanor on the mound and his ability to perform under pressure. Despite his relatively short career, Tudor left a significant impact on the teams he played for and is remembered as one of the better left-handed pitchers of his era.