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.
Michael Young was hitless in four at-bats in Friday and has just one RBI over his last 14 games.
David Phelps was removed in the eighth inning of Friday's game against the Rays after being drilled by a line drive on the right forearm.