This list was made after extensive research into the stats I believed to be the most important when it came to pitchers. I took a list of close to 200 candidates and looked at their career totals in Wins, ERA, WHIP, Saves, and Strikeouts.
I then ranked each player in each of those categories. After that I looked at what they averaged in those stats per year. This ensures that we are looking at quality along with quantity.
Next I weighted each stat accordingly, because let's face it, a save isn't as important as a win. Finally I tweaked the list here and there based on my own personal opinion.
I hope you enjoy, I'd love to hear feedback.