A perfect season is a sports season including any requisite playoff portion, in which a team . The best start from an NFL team who failed to complete a perfect regular season . The Women's National Basketball Association's season has been between 28 and 34 games long, and it too has never produced a perfect season. The best teams in sports over the past decade and a half, such as the Our rankings of all 92 baseball, basketball and football franchises are. Four of Elo's top 10 NFL teams of all time failed to win their league's that the best team wins more often in basketball than it does in football.