D.C. Mayor Vincent Gray is hoping Las Vegas' oddsmakers are wrong: He's made a bet on Sunday's Redskins game with the mayor of Seattle.

Under Gray's wager with Michael McGinn, the mayor whose team loses will have to fly the winner's flag over his city hall.

Gray's most recent gamble with another mayor didn't end well. In October, the District flew St. Louis' flag at the John A. Wilson Building after the Nationals crumbled in the National League Division Series against the Cardinals.

The Vegas sports books favor the Seahawks by 3 points in Sunday's game, which starts at 4:30 p.m. at FedEx Field in Landover.