Jerry Manuel made a big stink in spring training about keeping Jenrry Mejia in the MLB bullpen, to the chagrin of anyone with a modicum of common sense. He wanted Mejia to stick with throwing fastballs, in lieu of working on secondary pitches. From the NY Post on March 23:
"I would like to see [Mejia] stay with the hard stuff," Manuel said. "He has enough. If he can command that [cutter], he has enough."