San Francisco 49ers upset Philadelphia Eagles, 24–23

The 49ers closed as 9.5-point underdogs and won outright. The betting market gave them a 19% chance.

It was the biggest of 1 NFL upset in 2011 Week 4, and the 7th-biggest of the 2011 season. San Francisco 49ers pulled off 2 other upsets in 2011.

San Francisco 49ers’ other 2011 upsets

1. San Francisco 49ers 25, Detroit Lions 19

   Week 65.5-point underdog32% to winRecap
   Upset size5.5
2. San Francisco 49ers 36, New Orleans Saints 32

   Divisional round3.5-point underdog39% to winRecap
   Upset size3.5

More: San Francisco 49ers upsets · Philadelphia Eagles upsets · all Week 4 upsets · how upset size works