It’s easy to conclude Mariano Rivera is the greatest relief pitcher of all-time, and it’s equally difficult to see anyone surpassing his list of accomplishments. His 205 league-adjusted ERA+ is the best mark ever. He was a 13-time All-Star who played a major role in five World Series championships, even winning World Series MVP once. And he earned a perfect 100 percent of the vote from the BBWAA when he…

Mariano Rivera’s claim as the greatest closer of all-time is one of the safest arguments in baseball. No one has a legitimate argument to surpass Rivera, who made 13 All-Star teams, holds the highest adjusted ERA (205) in baseball history, and was a key component in the New York Yankees’ dynasty. Even though others have won Cy Young awards (and even regular season MVPs), Rivera was as close as you’ll…