Perfect season

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A perfect season is a sports season, including any requisite playoff portion, in which a team remains and finishes undefeated (and typically, untied). The feat is extremely rare at the professional level of any team sport but has occurred more commonly at the collegiate and scholastic levels in the United States. A perfect regular season (known by other names outside the United States) is a season excluding any playoffs, where a team remains undefeated; it is less rare than a complete perfect season but still exceptional. Exhibition games are generally not counted toward standings, for or against. For example, the 1972 Miami Dolphins lost three of their preseason exhibition games but are considered to have had a perfect season.