The Nationals have promoted left-hander Felipe Rivero from Triple-A Syracuse and sent righty Taylor Jordan back to the same team.
Director of player development Mark Scialabba said they liked what they saw out of Rivero during spring training, masnsports.com reports.
"Obviously electric arm. The fastball comes out good," Scialabba said. "He jumps on hitters and its just matter of him harnessing his stuff and just getting repetition. He certainly opened some eyes in spring training and had a great camp. He showed the ability to throw strikes and utilize his fastball, slider combination and a changeup as well that can play up here."
The move gives Washington two southpaws for its weekend series against Philadelphia. Rivero was off to a slow start in the minors this season with a 10.12 ERA. He performed well, however, in his last two appearances.
"He's powerful. We put him in the relieving role over the last six or seven times on the mound," manager Matt Williams said. "Three (games) at the end of spring training, a couple more in the minor leagues. He's gone back-to-back down there, so we feel confident in that regard. What he's shown us is he's throwing the ball over the plate, it's mid-90s fastball with breaking ball and changeup. We need another lefty, so he's a logical option for us. Power lefty out of the pen."