Kid Nichols, RHP
Career: 1890-1906, Beaneaters, Cardinals, Phillies
Fun fact: Compiled 361 wins over 15 seasons
Back in Nichols' day, being a 20-game winner wasn't enough. He won 27 games as a 20-year-old rookie for the Boston Beaneaters in 1890 and was a 30-game winner seven times.
Nichols almost always finished what he started, completing 532 of his 562 career starts.