Detroit Lions upset Seattle Seahawks, 28–20

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

It was the biggest of 4 NFL upsets in 1999 Week 1, and the 5th-biggest of the 1999 season. Detroit Lions pulled off 4 other upsets in 1999.

Other NFL upsets in 1999 Week 1

1. New England Patriots 30, New York Jets 28

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

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

   5.5-point underdogRecap
   Upset size5.5

Detroit Lions’ other 1999 upsets

1. Detroit Lions 23, Green Bay Packers 15

   Week 26.5-point underdogRecap
   Upset size6.5
2. Detroit Lions 24, Carolina Panthers 9

   Week 74.5-point underdogRecap
   Upset size4.5
3. Detroit Lions 31, St. Louis Rams 27

   Week 94-point underdogRecap
   Upset size4
4. Detroit Lions 25, Minnesota Vikings 23

   Week 63.5-point underdogRecap
   Upset size3.5

More: Detroit Lions upsets · Seattle Seahawks upsets · all Week 1 upsets · how upset size works