Nats put Stephen Strasburg on DL with an upper-back strain

How important is Strasburg to the Nationals? (1:00)

With Stephen Strasburg heading to the disabled list with an upper-back strain, the Baseball Tonight crew examines his importance to the Nationals. (1:00)

The Washington Nationals have placed pitcher Stephen Strasburg on the 15-day disabled list with an upper-back strain. The move, which is retroactive to June 16, comes a day after manager Dusty Baker announced that Strasburg had been scratched from his scheduled Sunday start in Milwaukee.

It was the second consecutive missed start for Strasburg, who was a last-minute scratch against the Dodgers on Monday.

Prior to that, the 27-year old hurler had started 14 games for the Nationals this year, going 10-0 with a 2.90 ERA. He's the first National League starter to begin the season 10-0 since San Diego's Andy Hawkins in 1985.

This marks Strasburg's first trip to the disabled list this season. Last year, Strasburg had two separate stints on the DL, including one for neck tightness. This past November, he underwent surgery to remove a non-cancerous growth from his back.

For his career, Strasburg -- who signed a seven-year, $175 million contract extension in May -- is 64-37 with a 3.07 ERA.

In Strasburg's place, righthander Tanner Roark will start on Sunday against the Brewers. The Nationals are expected to announce a corresponding roster move on Monday.