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Big Ten football Week 4 power rankings: New No. 1; Michigan, PSU fall

The latest Big Ten football power rankings following Week 4 action have brought significant shifts across the conference. Major upsets shook up the standings, causing Michigan and Penn State to drop while introducing a fresh occupant at the top spot.

Indiana narrowly avoided an upset against Northwestern, leaving their previous standing vulnerable. Meanwhile, Ohio State maintained strong form, and Oregon secured a notable ranked victory over USC.

Additional surprise wins were claimed by Minnesota, Wisconsin, and Iowa as conference play opened with turbulent results.

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