(AP Photo/Laurence Kesterson)

Two of college basketball's bluebloods remained firmly entrenched atop the AP Top 25 after a week of easy wins, while two more tumbled all the way out after a week filled with defeats.

One of them happens to be the reigning national champion.

While top-ranked Duke and No. 2 Kansas did little to hurt their status as early national title contenders, Villanova and Syracuse slid all the way out of the Top 25 on Monday. The Wildcats lost a rematch of last year's championship game with Michigan, then lost in overtime to Furman on Saturday to give coach Jay Wright's team back-to-back losses for the first time in five years.

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