Jack O'Brien and Mariano Rivera Comparison

You might be looking for a matchup, check Jack O'Brien's matchup page instead!

Who is the better baseball player Jack O'Brien or Mariano Rivera? It is a simple question that does not always have a simple answer. I assume that if you are here, you have questions about who is best in your match up or you need help changing someone's mind. I can't guarantee it will work, but good luck nonetheless.

If you are less interested in a Jack O'Brien vs. Mariano Rivera comparison and are more interested to see if one is tracking the other, then you are in luck! Click the “View Charts” link in the stat box to see how they compare over their careers. The data table and charts on these pages visualize how each player has progressed through their careers. They also summarizes both players' career performance.