Romero is an upgrade for the Nationals' bullpen, and he is expected to be used in a setup role in 2017. His acquisition will allow Washington to utilize veteran lefty Oliver Perez in a situational role. Sammy Solis could make the club as its third lefty out of the 'pen. The Nats now boast better overall depth in the bullpen.

Trading a player like Romero, at the height of his value, is something Tampa Bay has done well over the years. In return the Rays get Rosa, a 21-year-old pitcher who has not done much so far in his pro career. The Rays hope he can put it together and become a quality pitching prospect for them. It is a bit of a long shot.

Romero's value should increase in Washington, where he is expected to see far more opportunities for holds (and also a few saves) in 2017. As for Rosa, he is a pitcher to watch for in the coming seasons. There is no reason to own his rights yet, however.