The Tigers bullpen has allowed fewer runs, but has been less effective in protecting a lead this season.
The Detroit Tigers have had one of the weakest bullpens in the American league in every season since 2006, judging by the number of runs allowed. Looking at the percentage of time that the bullpen holds the lead when one is given to them has put the Tigers' relief corps in a much more favorable light the past several seasons.
In 2014, Detroit's bullpen was true to form, posting the third highest bullpen ERA in the American league, but ranking in the top third of the league in save percentage.