The Nationals put rookie pitcher Stephen Strasburg on the 15-day disabled list with a strained flexor tendon, but there is concern that he has a more serious elbow injury. He is scheduled for another test this week on his strained right forearm. While pitching in Philadelphia last Saturday, Strasburg recoiled after throwing a pitch in the fifth inning. He was removed from the game and Washington doesn't know when he'll pitch again. The flexor tendon can impact the stability and the integrity of the elbow ligament.