The Opsera Database Opsera is a statistical system we created to rank every team and season since 1903.
The Worst Team Seasons Of All-Time (Opsera) Is there an objective way to determine the worst teams of all-time? Using the Opsera system, which is a statistic that takes both OPS and ERA into account, we get a definitive list.
The Best Team Seasons Of All-Time (Opsera) Is there an objective way to determine the best teams of all-time? Using the Opsera system, which is a statistic that takes both OPS and ERA into account, we get a definitive list.
Washington Nationals, Opsera History The Montreal Expos became the Washington Nationals for the 2005 season and haven't had as much success as they would have liked.
