Iowa stuns No. 5 Penn State, 21–10

It was unranked Iowa taking down the No. 5 team in the AP poll.

It was the 2nd-biggest of 7 upsets in 2009 Week 4, and the 4th-biggest of the 2009 season. Iowa pulled off 1 other upset in 2009.

Other upsets in 2009 Week 4

1. South Carolina 16, No. 4 Ole Miss 10

   Unranked beat No. 4Recap
   Upset size11
2. Oregon 42, No. 6 California 3

   Unranked beat No. 6Recap
   Upset size10
3. South Florida 17, No. 18 Florida State 7

   Unranked beat No. 18Recap
   Upset size4
4. Georgia Tech 24, No. 22 North Carolina 7

   Unranked beat No. 22Recap
   Upset size2
5. No. 11 Virginia Tech 31, No. 9 Miami 7

   No. 11 beat No. 9Recap
   Upset size1

Iowa’s other 2009 upsets

1. No. 10 Iowa 24, No. 9 Georgia Tech 14

   BowlNo. 10 beat No. 9Recap
   Upset size0.5

More: Iowa upsets · Penn State upsets · all Week 4 upsets · the 2009 season · how upset size works