 In 1972, the Dolphins completed the NFL's first and only perfect season, winning every regular season game, two playoff games, and Super Bowl VII, defeating the Washington Redskins 14–7 (the 1948 Cleveland Browns had accomplished an undefeated season, but as members of the All-America Football Conference).During this season, Griese suffered a broken ankle in Week 5 versus the San Diego Chargers and was replaced by veteran Earl Morrall for the rest of the regular season, with Griese returning to the field as a substitute during the AFC Championship game versus the Pittsburgh Steelers and would once again start for Miami in Super Bowl VII.On the ground, running backs Larry Csonka and Mercury Morris became the first teammates to each rush 1,000 yards in a season.