Stephen Strasburg pitching through hamstring tightness

Nationals manager Davey Johnson revealed that pitcher Stephen Strasburg has dealt with minor hamstring tightness over his last few starts, the Washington Post reports.

The minor injury played into Johnson's decision not to move Strasburg up a day to start Saturday, with Tanner Roark instead receiving his first career major-league start. Strasburg is 6-9 with a 2.85 ERA, 1.04 WHIP and 174:50 K:BB ratio in 164 innings over 27 starts.