D.C. fired the first big shot this off-season, getting ace SP Matthew Casey from the Cardinals for pitching prospects Dick Pederson and Asdrubal Rivera.
Casey has an excellent 3.57 ERA and 112 wins over 10 ML seasons. He joins Albert Velasquez to give the Nats the 2-ace combo that seems to be a requirement to compete in the NL East.
Pederson was the #17 overall pick last year; Rivera was the 28th pick of the Season 19 draft.
In another significant deal, the Twins bolstered the attack by getting DH Cutter Nieman (along with OF prospect Javier Alberro) from the Red Sox for SP prospect Zach Lennon.
Nieman was Boston's #1 selection (40 overall) in the Season 14 draft, and posted a promising .328/8/35 in limited action last year. Alberro was the 41st pick of the Season 19 draft, and Lennon was picked #31 overall in Season 19.
In the only other off-season trade completed so far, Baltimore got 3B/OF Vicente Castro (Season 17 IFA), sending 2B/CF prospect Mike Wainhouse (12th overall last year) to Nashville.