The all-time worst team in MLB history, the 1899 Cleveland Spiders, finished with a brutal 20-134 record. That’s a .13 winning percentage, the lowest ever recorded. The team was so bad, other teams refused to travel to Cleveland, forcing the Spiders to play most of their games on the road.
This National League team set the record for most losses in a season, and the franchise was dissolved soon after. No MLB team since has come close to matching this level of futility.