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 this season.

No. 2 Alabama has 13 first-place v...

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