From the Nats website:
Injury report: Right-hander John Patterson (right elbow and biceps) threw two innings in a simulated game on Sunday in Potomac. He threw 35 pitches, and 23 of them were for strikes. He threw both fastballs and curveballs. Patterson is scheduled to throw a side-session on Tuesday in Baltimore and then a three-inning, 50-pitch rehab start with Class A Potomac on Friday.
Right-hander Jerome Williams (labrum tear) is scheduled for a three-inning, 50-pitch rehab start Friday with Double-A Harrisburg.
Right-hander Jason Bergmann (sore elbow) is scheduled for a three-inning, 50-pitch rehab start Friday with Triple-A Columbus.
Mike O'Connor (sore elbow) threw 47 pitches in his three innings with Potomac on Sunday. He threw fastballs, curveballs and changeups. He will next throw a side-session on Tuesday with Double-A Harrisburg.
Alex Escobar (separated right shoulder) went 1-for-5 with an RBI and a walk as the designated hitter for Potomac on Sunday. Escobar is now slated to join Harrisburg and continue his rehab.