[Bearcat]

Originally Posted by philfree

So when was the last time the #1 seeds advanced the SB?

LMGTFY

No. 1 vs. No. 1 was the Super Bowl matchup six times before the playoff field expanded to 12 teams (six from each conference) during the 1990 season:

Super Bowl 11: No. 1 Raiders 32, No. 1 Vikings 14
Super Bowl 12: No. 1 Cowboys 27, No. 1 Broncos 10
Super Bowl 16: No. 1 49ers 26, No. 1 Bengals 21
Super Bowl 18: No. 1 Raiders 38, No. 1 Redskins 9
Super Bowl 19: No. 1 49ers 38, No. 1 Dolphins 16
Super Bowl 24: No. 1 49ers 55, No. 1 Broncos 10

Here are the seven times it happened before the NFL expanded the playoffs to 14 teams starting with the 2021 season:

Super Bowl 26: No. 1 Redskins 37, No. 1 Bills 24
Super Bowl 28: No. 1 Cowboys 30, No. 1 Bills 13
Super Bowl 44: No. 1 Saints 31, No. 1 Colts 17
Super Bowl 48: No. 1 Seahawks 43, No. 1 Broncos 8
Super Bowl 49. No. 1 Patriots 28, No. 1 Seahawks 24
Super Bowl 50: No. 1 Broncos 24, No. 1 Panthers 10
Super Bowl 52: No. 1 Eagles 41, No. 1 Patriots 33