Assuming everything checks out health-wise in the coming days, Strasburg's next step will be a rehab start, likely four innings and 65-70 pitches.
"He was optimistic about it from the time he went to the bullpen to warm up," Williams said. "Good positive step."
The 27-year-old is 5-5 with a 5.16 ERA and 1.49 WHIP in 13 starts this season.
John McGonigal is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.