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The 1972 Miami Dolphins are one of the best-known NFL teams in the leagues history for being the only one in the modern-era to complete an entire season, regular season and playoffs, with an undefeated record.
Miami went 14-0 in the regular season, won both playoff games to reach Super Bowl VII and then defeated the Washington Redskins 14-7 to finish with a perfect 17-0 record.
The feat has yet to be matched by any other team, with the 2007 New England Patriots coming the closest.