In his first 10 starts of the season, Strasburg posted a 6.55 ERA. But after returning from his first DL stint, for a strained left trapezius, he produced a 1.15 ERA with 18 strikeouts over 15 2/3 innings before sustaining another injury.
The Nationals have used rookie Joe Ross in Strasburg's place for the last couple of turns through the rotation. Ross took the loss on Sunday despite a quality start at Pittsburgh, and he has a 3.03 ERA over five outings this season.
Andrew Simon is a reporter for MLB.com. Follow him on Twitter @AndrewSimonMLB. This story was not subject to the approval of Major League Baseball or its clubs.