Is Mo writing the best comeback ever?

This past NFL season, a 36-year-old Peyton Manning shook off four neck surgeries and the rust of a year off to nearly win the MVP.

In the NBA, Michael Jordan won three championships, spent almost a full season away and came back at 31 years old to win another three titles.

In hockey, a 29-year-old Mario Lemieux returned from Hodgkin's lymphoma after missing a full season and won the Hart Trophy as the NHL's MVP.

And now, here is Mariano Rivera at 43, adding to his legend and putting his name in this exclusive club of iconic sports comebacks.

Still, what the indisputable greatest closer of all time is doing in 2013 makes even the man who might be the second-best ever sound as if he is in awe.

"He is going to go out on top," said Hall of Famer Dennis Eckersley, who is a TBS MLB analyst. "He is just too great."

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