Abel De Los Santos

Acquired from the Rangers last offseason in the trade for Ross Detwiler, De Los Santos put together a strong campaign out of the Double-A Harrisburg bullpen, and even got a brief MLB audition in July. The 23-year-old right-hander has made great strides with his control since moving to a relief role a couple seasons ago, and his mid-90s fastball and slider have allowed him to rack up a 9.4 K/9 over the last two seasons. Now on the 40-man roster, De Los Santos is in good position to make the jump to the majors permanently if he has a strong showing in spring training, as the Nationals ended 2015 with a bullpen in tatters following a number of injuries and poor performances. If the front office looks for internal options rather than outside the organization, De Los Santos could be at the top of the list for a middle relief role.