It must be a really good league if all the relievers that have already been mentioned are gone. If so, props for being in that competetive a league
, and looking into deep sleeper middle relievers.............. Consider Kiko Calero.
Kiko Calero is , reliever for the Cardinals. Out of 23 relief appearances this year he has only given up earned runs in 3 of those appearances. Only two of those three appearances were bad outings. An injury forced him to the DL relatively early last year after he started out putting up great relief numbers, and held him out of a little more than the first month of this season. His numbers are almost as strong as last year since returning so far. He isnt factoring into decisions or getting saves yet and might not. His ERA/K/WHIP help are fairly impressive as a middle reliever so far though. Season stats are 24.7INN, 27K's, 3.284ERA, and a very impressive 0.892WHIP.
Not much name recognition for him at all, but a decent MR option if you need help in a very deep league.
"Son we would like to keep you around here but were trying to win a pennant this year."