WASHINGTON -- Left-hander Scott Olsen, on the disabled list because left shoulder tightness, has started his throwing program again and played catch from 90 feet on Friday at the team's complex in Viera, Fla., without any problems.

Olsen had a setback more than a week ago and stopped throwing until Friday. General manager Mike Rizzo did not give a timetable on when Olsen would be activated from the DL.

Before getting hurt, Olsen was one of the Nationals' best pitchers, going 2-2 with a 3.77 ERA.