The Washington Nationals have put pitcher Stephen Strasburg on the 10-day injured list with right shoulder inflammation, the team announced Sunday.

Strasburg was set to start against the Arizona Diamondbacks, but will be replaced by 34-year-old right-hander Paolo Espino. It will be the fourth start in Espino's career.

Strasburg's IL move is retroactive to Thursday. In Strasburg's last start, a 14-3 road loss to the St. Louis Cardinals on Tuesday, he was tagged for seven earned runs on eight hits and gave up five walks in four-plus innings. Strasburg's average velocity in the game was 90.6 mph, a little more than 2 mph slower than in his season debut.

During Tuesday's game, cameras caught Strasburg rubbing his shoulder while sitting on a chair in the tunnel leading down from the team's dugout. Despite that, Strasburg continued to pitch.

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