Seattle Seahawks beat Arizona Cardinals, 38–30

The Seahawks closed as 5.5-point underdogs and won outright. The betting market gave them a 33% chance.

It was the 3rd-biggest of 5 NFL upsets in 2021 Week 18, and the 33rd-biggest of the 2021 season. It was Seattle Seahawks's only upset win of 2021.

Other NFL upsets in 2021 Week 18

1. Jacksonville Jaguars 26, Indianapolis Colts 11

   14-point underdog13% to winRecap
   Upset size14
2. Miami Dolphins 33, New England Patriots 24

   6-point underdog32% to winRecap
   Upset size6
3. Detroit Lions 37, Green Bay Packers 30

   4-point underdog36% to winRecap
   Upset size4
4. Las Vegas Raiders 35, Los Angeles Chargers 32

   3.5-point underdog38% to winOTRecap
   Upset size3.5

More: Seattle Seahawks upsets · Arizona Cardinals upsets · all Week 18 upsets · how upset size works