Gio throws on flat ground without discomfort

WASHINGTON -- Nationals left-hander Gio Gonzalez threw on flat ground for the first time since he was placed on the disabled list this past Sunday because of left shoulder inflammation. He threw for only a few minutes, but didn't complain about discomfort in the shoulder.

Gonzalez will throw on flat ground again Sunday at PNC Park. Manager Matt Williams didn't give any timetable as to when Gonzalez will be activated from the disabled list.

"He'll stretch it out a little bit more tomorrow and look to getting back on the mound," Williams said.