Detroit Lions upset Seattle Seahawks, 28–20

The Lions closed as 9.5-point underdogs and won outright.

All 1999 NFL Week 1 upsets, biggest first

An NFL upset is an underdog getting 3.5 or more points on the closing line winning outright. Upset size is the points it overcame. How it’s scored

1. Detroit Lions 28, Seattle Seahawks 20

   9.5-point underdogRecap
   Upset size9.5
2. New England Patriots 30, New York Jets 28

   7-point underdogRecap
   Upset size7
3. Miami Dolphins 38, Denver Broncos 21

   6-point underdogRecap
   Upset size6
4. New York Giants 17, Tampa Bay Buccaneers 13

   5.5-point underdogRecap
   Upset size5.5