Matt Joyce (hamstring) was 1-for-4 with an RBI double and a run scored in his return to action Friday.
Jeff Karstens has been shut down after feeling pain in his right shoulder during his throwing program on Friday.
Nationals designated RHP Yunesky Maya for assignment.
Twins optioned OF Oswaldo Arcia to Triple-A Rochester.
Roy Oswalt struggled in his rehab start for Double-A Tulsa on Friday, surrendering three runs on four hits over his five innings of work.
Jordan Zimmermann became the National League's first eight-game winner after allowing two runs in seven innings Friday in a 5-2 victory over the Phillies.
Kyle Kendrick was tagged for five runs in five innings Friday in a loss to the Nationals.
Steve Lombardozzi went 3-for-4 with a two-run double in Friday's win over the Phillies.