Conor Mullee

Mullee entered 2016 as a mostly unheralded prospect, but he was extremely impressive in his first extended look at the Triple-A level. He worked to a 0.99 ERA with 45 strikeouts in 36.1 innings with Scranton/Wilkes-Barre, en route to his first call up to the big leagues. The 28-year-old appeared in just three games before an injury sidelined him in the beginning of July, and he underwent season-ending surgery in August to address a nerve issue in his elbow. The righty has already had Tommy John surgery twice in his career, so any time he goes under the knife can be concerning, but he's expected to be back in time for the start of spring training. Mullee has an arsenal that consists of a fastball, slider and changeup, and he has displayed impressive command with that mix in the minors. He'll have a shot to win a bullpen spot to open the season but would likely be assigned more toward the middle innings than the end of a game.