Keith Burgess-Jackson, J.D., Ph.D.

Over the course of his career, Mariano Rivera has converted 89.0% of his save opportunities (572 of 642). Jonathan Papelbon has converted 87.9% (197 of 224) and Francisco (K-Rod) Rodriguez 86.0% (283 of 329). I wish I had data on the greats, such as Trevor Hoffman, Lee Smith, John Franco, Billy Wagner, Dennis Eckersley, and Rollie Fingers. I find it hard to believe that Rivera is at the top.