The San Francisco 49ers never have tasted defeat in a Super Bowl, going 5-0. It's the most impressive mark for any franchise in the big game.
Baltimore also is undefeated, with the Ravens winning their only appearance, in 2001.
Someone will have the Super Bowl blahs for the first time after Sunday's title game in the Superdome.
The Ravens (13-6), who are 3 1/2 -point underdogs, are on one of those runs reminiscent of recent NFL champions. Indeed, the New York Giants reached the Super Bowl a year ago in a similar manner, winning a wild-card game at home, then two playoffs on the road, including an overtime thriller.
The Giants got healthy down the stretch, something the Ravens have replicated, particularly on defense where star linebackers Ray Lewis and Terrell Suggs are giving vintage performances following injury-shortened seasons.
''I believe we have found a way to believe in each other, and nothing else matters,'' said Lewis, who will retire after the game. ''That is one thi...