What are the worst records in MLB history?

The Colorado Rockieshad a rough run during the 2025 MLB season. At the 50-game mark, they made history with the worst start in the modern MLB era. By September, they finished the season with the worst MLB record of the year: 43-119. At Coors Field, they finished 25-56, which marked the most home losses in franchise history. They also finished the season with the worst run differential in modern MLB history, at minus-424.

The Chicago White Soxstruggled at an even worse historical level during the 2024 season. At the end of September, the White Sox broke the modern MLB era record for most lossesin a season.

Check out the historical rundown below:

Worst Records, MLB Historybr/>(Min. 150 Games Played; W-L, Win Pct)

1899 Cleveland Spiders: 20-134, .130

1916 Philadelphia A's: 36-117, .235

1935 Boston Braves: 38-115, .248

1962 New York Mets: 40-120, .250

1904 Washington Senators: 38-113, .252

2024 Chicago White Sox: 41-121, .253

Most Losses in a Season, MLB History br/>(W-L, Win Pct)

1899 Cleveland Spiders: 134

2024 Chicago White Sox: 121

1962 New York Mets: 120

2003 Detroit Tigers: 119

2025 Colorado Rockies: 119

1916 Philadelphia Athletics: 117

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