The Nationals activated Williams (elbow) from the 60-day injured list Friday, Mark Zuckerman of MASNSports.com reports.
Williams will rejoin the Nationals' rotation Friday with a start against the Cubs after missing nearly four months of action with a right flexor strain. He threw 73 pitches in his most recent rehab start, so Williams should be only slightly limited Friday from a workload perspective. The veteran righty collected a nifty 2.22 ERA, 1.08 WHIP and 47:16 K:BB across 56.2 innings before getting hurt.