The Padres activated Pivetta (forearm) from the 60-day injured list Monday.
Pivetta will rejoin the Padres rotation with a start Monday against the Nationals after missing nearly five months of action due to a flexor strain. The veteran right-hander fanned seven over 4.1 shutout innings in his final rehab start with Triple-A El Paso on Aug. 30. Pivetta threw 64 pitches in that outing, so he won't be ready to handle a full workload Monday.