Pirates acquired LHP Felipe Rivero and LHP Taylor Hearn from the Nationals for RHP Mark Melancon.
According to Ken Rosenthal of FOX Sports, Felipe Rivero will head to the Pirates as part of the Mark Melancon trade.
Felipe Rivero was blasted for six runs -- five earned -- without retiring a batter on Saturday versus the Padres.
With closer Jonathan Papelbon unavailable, Felipe Rivero recorded the last out of the night to notch a save in Tuesday's win over the Braves.
Felipe Rivero tossed a 1-2-3 ninth inning Saturday against the Mets for his second save of the season.
Felipe Rivero recorded his first major league save with two perfect innings Thursday against the Braves.
Nationals recalled LHP Felipe Rivero from Triple-A Syracuse.
Nationals activated LHP Felipe Rivero from the 15-day disabled list; optioned him to Triple-A Buffalo.
Felipe Rivero (stomach) is scheduled to begin a rehab assignment Monday with Triple-A Syracuse.
Felipe Rivero's (stomach) blood levels are back to normal following a procedure nearly three weeks ago to repair a burst ulcer.
Nationals placed LHP Felipe Rivero on the 15-day disabled list due to gastrointestinal bleeding.
Felipe Rivero will join the Nationals on Thursday.
Nationals optioned LHP Felipe Rivero to Double-A Harrisburg.