Pud Galvin, RHP
Career: 1875-92, Pirates, Bisons
Fun fact: Baseball's first 300-game winner
Galvin ranks second only to Cy Young in complete games and innings pitched. Like Young, he was a durable starter, belying a physique that gave him the nickname Pudding -- hence the more dignified Pud.
Galvin acquired latter-day notoriety for perhaps being baseball's first-ever PED user because he admitted to drinking an elixir that contained monkey testosterone in 1889.