A team that earns the No. 1 ranking from AP voters rarely loses its spot atop the rankings without sustaining a loss.

Notice I said rarely; it doesn't happen often. But it does happen.

And my official guess: It happens this week for a third time this season when the rankings refresh on Monday. And again, it will be Purdue that loses the No. 1 spot despite remaining undefeated, if indeed voters make the switch.

The preseason No. 1 Boilermakers fell from No. 1 to No. 2 in Week 2 despite a 2-0 start with double digit wins over Evansville and Oakland -- surmounted by then-No. 2 Houston jumping one spot. Purdue reclaimed the No. 1 ranking last week after defeating Alabama and Akron . But they're positioned to fall back from No. 1 again, as you can gather by this predictive d

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