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

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A few major upsets have changed how things look in the Big Ten Week 4 power rankings.

Indiana's spot in the rankings is no longer secure as they nearly dropped a game earlier in the week to Northwestern.

Ohio State looks as good as ever, and Oregon picked up a huge ranked win over USC.

Minnesota, Wisconsin, and Iowa all took home crucial upset victories as conference play has already gotten off to a wild start.

Big Ten football power rankings after Week 4

Ohio State Buckeyes (3-1)
Indiana Hoosiers (4-0)
Oregon Ducks (3-1)
Iowa Hawkeyes (4-0)
Nebraska Cornhuskers (4-0)
USC Trojans (4-1)
Michigan Wolverines (3-1)
UCLA Bruins (4-0)
Wisconsin Badgers (3-1)
Penn State Nittany Lions (3-1)
Northwestern Wildcats (2-1)
Minnesota Golden Gophers (3-1)
Washington Huskies (3-1)
Illinois Fighting Illini (2-2)
Michigan State Spartans (2-2)
Maryland Terrapins (2-2)
Purdue Boilermakers (1-3)
Rutgers Scarlet Knights (1-3)

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