The New England Patriots have lost three Super Bowls:
Super Bowl XX: Lost to Chicago Bears, 46-10.
Super Bowl XXXI: Lost to Green Bay Packers, 35-21.
Super Bowl XLII: Lost to New York Giants, 17-14.
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The Denver Broncos have appeared in seven Super Bowls and won twice. Here are the results (victories in bold):
The Giants in Super Bowl XLII, the Packers in Super Bowl XXXI, and the Bears in Super Bowl XX.
The Patriots defeated the St. Louis Rams in Super Bowl XXXVI, the Carolina Panthers in Super Bowl XXXVIII, and the Philadelphia Eagles in Super Bowl XXXIX.