Last year, Robert Stephenson came back from oblivion, to many posters' collective surprise, to become a solid bullpen contributor.
The year before, both David Hernandez and Jared Hughes put up All-Star level production in limited bullpen innings.
In 2017, Eugenio Suarez cemented himself as a first division starter after basically being ignored by most national experts as nothing more than filler, and Scott Schebler hit 30 HR and looked like a real steal as a solid, developing OF. (Alas...) 2017 also brought Luis Castillo and his electric stuff up from the minor leagues.
Who is this season's sleeper Red?