FOX Sports' Jon Morosi reports that "mutual interest has developed already" between the Tigers and Joe Nathan. After Nathan declined his 2014 option earlier this month, the speculation that he could sign with the Tigers was immediate. It makes a ton of sense for both sides, as the Tigers are World Series contenders but are looking for some stability at the back-end of the bullpen. Nathan is coming off a season where he put up a 1.39 ERA while striking out over a batter per inning.