You have a No. 1 seed making the SB pretty much every year, but there hasn't been a matchup of two No. 1s since Bills-Cowboys II. Since 1997, home teams are just 12-10 in the championship games. Most of the 10 losses really can't be called upsets, other than the Giants-Packers last year...for example, the Patriots were defending champs, went 14-2 and were favored at Pittsburgh in 2005. in 2000, the Titans were the wild-card but went 13-3 and beat Jacksonville three times.