The Raiders have lost three straight games and seven of their last eight, but they’ve covered two straight and three of their last four.

Sharp bettors expect the Silver and Black to extend their spread streak as home underdogs to the Cowboys on “Monday Night Football” at Allegiant Stadium.

Dallas is a consensus 3½-point favorite but the line has dipped to 3 at several sportsbooks, including Circa Sports, South Point and Westgate SuperBook, which reported sharp action on the Raiders.

“One of our sharper players took the Raiders +3½ -108 on Tuesday, so there’s definitely some sharp action on the Raiders at 3½,” SuperBook vice president of risk Ed Salmons said. “I’m sure it’s just betting against Dallas. When they win by three, they’re pretty happy.

“You would think the Raiders would scor

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