College football · NFLTuesday, October 13, 2026
The Upset Report
NFL · 2023 · Week 1 · Thursday, September 7, 2023

Detroit Lions beat Kansas City Chiefs, 21–20

The Lions closed as 4-point underdogs and won outright. The betting market gave them a 36% chance.

Final21–20
Upset size4
Chance to win36%
Rank in 202338th of 47

It was the 2nd-biggest of 3 NFL upsets in 2023 Week 1, and the 38th-biggest of the 2023 season. It was Detroit Lions's only upset win of 2023.

Other NFL upsets in 2023 Week 1

  1. Los Angeles Rams 30, Seattle Seahawks 13
    4.5-point underdog34% to winRecap
    Upset size4.5
  2. Tampa Bay Buccaneers 20, Minnesota Vikings 17
    4-point underdog36% to winRecap
    Upset size4

More: Detroit Lions upsets · Kansas City Chiefs upsets · all Week 1 upsets · how upset size works