Souza said Saturday that his shoulder is still a little stiff but he thinks he'll be fine by Sunday, Dan Kolko of MASNsports.com reports. The 25-year-old was fortunate to avoid a head injury after a collision with the right field wall Friday, and it sounds like his shoulder affliction is relatively minor. Souza's compiled a very impressive .354/.435/.601 batting line with 18 homers and 24 steals in 91 games with Triple-A Syracuse this season, but his opportunities may remain limited barring injury to one of the Nats' starting outfielders.