What major league baseball team holds the record for worst season record?

The 1899 Cleveland Spiders of the National League hold the Major League Baseball (MLB) record for worst regular season record (of all eras) with a record of 20-134, giving them a winning percentage of .130.

In 1899, the Cleveland Spiders also set major league records for most consecutive losses in a season (24, from July 26 to September 16), most losses in a month (27 in July), and had 6 double-digit losing streaks. They lost 40 of their last 41 games.