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          Michigan and six other undefeated teams facing prove-it games this week

          • Adam Rittenberg, ESPN Senior WriterSep 28, 2021, 11:00 AM
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            • College football reporter.
            • Joined ESPN.com in 2008.
            • Graduate of Northwestern University.
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          There are certain games on every team's schedule that provide clear markers of progress. For Michigan, this week's trip to Wisconsin was always going to be that game in 2021.