Baltimore Ravens Keith Washington (93) and Chris McAlister (21) celebrate the Ravens Super Bowl win over the New York Giants in Tampa, Fla., on Jan. 28, 2001. The Ravens beat the Giants 34-7.

Super Bowl betting trends tell a pretty interesting story. For nearly two decades, underdogs dominated the spread, covering 12 times in 17 years between the 2000s and 2010s. However, that trend ...