Mariano Rivera, the ultimate baseball x-factor of the last several decades, is hanging up his spikes at the end of this season.  His teammate, Derek Jeter, is in the final year of a three-year deal with a player option for 2014, which he will likely pick-up, assuming he can play at somewhat of a high level in his return from an ankle injury.  Which Hall of Famer will you miss more when they are both retired?  Vote here: