Felipe Rivero will join the Nationals on Thursday.
Nationals optioned LHP Felipe Rivero to Double-A Harrisburg.
Nationals acquired LHP Felipe Rivero, OF Drew Vettleson, and C Jose Lobaton from the Rays for RHP Nate Karns.
Felipe Rivero is headed to the Nationals as part of the four-player Jose Lobaton-Nate Karns trade.
Rays purchased the contract of LHP Felipe Rivero from Low-A Bowling Green.