O'Brien led one final drive, hitting Pedersen on an 11-yard touchdown pass with 1:31 left that kept the Badgers from being shut out for the first time in 15 years.
The onside kick was smartly executed by Wisconsin kicker Kyle French, who hit it with his left foot and was initially ruled to have recovered it at the Badgers 46. The play was reviewed and determined that French touched the ball before it went 10 yards giving possession to the Beavers.
Mannion knelt down three times and the upset was complete with the orange-clad Beavers fans racing from the stands and covering the Reser Stadium turf as the final seconds ticked away.
"This might be one of the top moments of my college career," Poyer said. "I still believe there are a lot more moments to come in my senior season. The sky is the limit for us right now."
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.