The left-handed prospect was recalled from Rochester on Friday and could slot into the Nationals' rotation as they manage workloads through the first month. Alvarez has electric stuff with a fastball that sits 94-96 and a sweeper that generates chase. The Nationals' rotation depth is thin enough to give him a real shot at 5+ starts. At 3% owned, he's essentially free — the kind of speculative add that costs nothing and could return SP4 value if the stuff translates.