Sandy Koufax
Back in 1955, Sandy Koufax joined the MLB as a left-handed pitcher for the Dodgers. During his tenure, the Dodgers won four World Series pennants, two of them with Koufax as MVP. He also won the Cy Young Award three times, becoming the first pitcher to win more than one. In his later years in the league, Koufax went to great lengths to pitch through severe arm pain, eventually leading him to retire at age 30. His early retirement had a silver lining, though, as he later became the youngest player elected to the Baseball Hall of Fame at 36.