NEW YORK -- Arkansas has taken the second-largest fall out of the AP college football poll, dropping from eighth to unranked after losing to Louisiana-Monroe.

The Razorbacks were upset 34-31 in overtime after losing quarterback Tyler Wilson to an injury. The only team to take a more drastic fall from the poll was Michigan in 2007. The Wolverines opened the season at No. 5 and dropped out after a Week 1 loss to Appalachian State.

Alabama remains No. 1. Southern California is No. 2, followed by LSU and Oregon. Florida State moved into a tie for fifth with Oklahoma. Georgia is No. 7.

Arkansas was one of four teams to drop out after losses, along with Nebraska, Wisconsin and Oklahoma State.

Wisconsin, Nebraska and Oklahoma State all lost on the road, though none in a more startling fashion than the Badgers.

Wisconsin fell 10-7 at Oregon State, managing only 207 yards of offense. Montee Ball, last year's Heisman Trophy finalist, had his streak of games with a touchdown snapped at 21 and was held to 61 yards on 15 carries.

"Any loss absolutely disturbs me to no end," Wisconsin coach Brett Bielema told reporters after the game.

This loss should be particularly perplexing. Wisconsin averaged 44 points per game last year, and even though quarterback Russell Wilson is gone and the offensive line has been revamped, nobody saw this coming.

The four teams that fell out of the poll all had become mainstays in recent years.