Baseball

The Curse of Rocky Colavito is a phenomenon that supposedly prevents the Cleveland Guardians of Major League Baseball (MLB) from winning, be it the World Series, the American League (AL) pennant, reaching postseason play, or even getting into a pennant race. Its origin is traced back to the unpopular trade of right fielder Rocky Colavito to the Detroit Tigers for Harvey Kuenn in 1960. It was not claimed that Colavito placed the curse, and he has denied doing so. It is one of several curses believed to have stricken the city of Cleveland's major sports franchises for decades.

The Guardians, then known as the Cleveland Indians, played in the World Series in 1995, 1997, and 2016, but lost all three to the Atlanta Braves, Florida Marlins, and Chicago Cubs, respectively. Cleveland has not won a World Series since 1948.

https://en.wikipedia.org/wiki/Curse_of_Rocky_Colavito