AP Pro Football Writer
NEW ORLEANS (AP) -- 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
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