Indianapolis Colts upset Detroit Lions, 35–33

The Colts closed as 7-point underdogs and won outright. The betting market gave them a 26% chance.

All 2012 NFL Week 13 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. Indianapolis Colts 35, Detroit Lions 33

   7-point underdog26% to winRecap
   Upset size7
2. St. Louis Rams 16, San Francisco 49ers 13

   7-point underdog25% to winOTRecap
   Upset size7
3. Pittsburgh Steelers 23, Baltimore Ravens 20

   7-point underdog27% to winRecap
   Upset size7
4. Kansas City Chiefs 27, Carolina Panthers 21

   5-point underdog34% to winRecap
   Upset size5