No, the only undefeated team in history was the 1972 Miami Dolphins, with quarterback Bob Griese, not Dan Marino. The '72 Dolphins went 17-0, which included all 14 regular season games, the two playoff games before the Super Bowl, and the Super Bowl, in which they defeated the Washington Redskins. So, NO, Dan Marino DID NOT ever go undefeated. And the New England Patriots.
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