NEW YORK — David Letterman is going to love this: At No. 25 in the AP college football poll, his alma mater, Ball State.

The Cardinals, who have remained unbeaten while losing one of their best players to a career-ending spine injury, are ranked in the Top 25 for the first time.

After a week with few upsets, the top of media poll only underwent slight alterations.

Oklahoma was No. 1 with 51 first-place votes and 1,608 points, gaining a few points and top votes in its second week on top of the rankings.

No. 2 Alabama has 13 first-place votes and 1,537 points. Missouri moved up one spot to No. 3 after winning 52-17 at Nebraska.

LSU dropped a spot to No. 4 after an off week, and Texas remained No. 5. The Longhorns and Sooners meet Saturday in the annual Red River Rivalry in Dallas. It'll be the fourth time since 2001 that Texas and Oklahoma will play with both teams in the top five and first time since 2004.

No. 6 Penn State and No. 7 Texas Tech held their spots. No. 8 Southern California and No. 9 BYU flip-flopped after USC's easy 44-10 victory against Oregon.

Pittsburgh, which started the season ranked and dropped out after losing its opening game, is back in the Top 25. The Panthers are No. 24 after upsetting South Florida 26-21 on Thursday night in Tampa.

Dropping out of the poll after losses were Fresno State, Oregon, Connecticut and Wisconsin.