Lisa Blumenfeld/Getty

Clayton Kershaw, who went on the 10-day DL yesterday after being pulled from his start against the Braves after two innings with lower-back tightness, could be out of action for more than a month.

So says Ken Rosenthal, who reports that Kershaw could be out four to six weeks, but will get a second opinion:

Kershaw missed two months last season with a herniated disk in his back, but Dodgers manager Dave Roberts said yesterday his first impression is that this back issue “is muscular and unrelated to the herniated disk.”

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Kershaw is having a typically dominant season, posting a 205 ERA+ in 21 games, and now he joins a long list of other Dodgers on the DL, including his rotation-mate Brandon McCarthy, who landed on the DL yesterday with a blister.

The Dodgers have the luxury of a 10.5-game lead in the NL West and have looked invincible, excluding a pair of losses this weekend. A six-week absence would bring Kershaw back around Labor Day, which could allow him a handful of starts before the start of the postseason.