The Pirates have agreed to trade Melancon to the Nationals, Ken Rosenthal of FOX Sports reports.
Specifics of the deal are still coming in, but the Nats will reportedly send Felipe Rivero and multiple prospects to Washington in return for Melancon. Melancon figures to step into the closer role right away for Washington, as manager Dusty Baker was unwilling to commit to Jonathan Papelbon remaining the team's closer when asked Saturday following three straight poor outings. Lefty Tony Watson will presumably inherit the ninth-inning job for the Pirates.