What is the longest losing streak to one single opponent?

Answer 1

The longest losing streak to a single opponent in professional sports is held by the Boston Red Sox against the New York Yankees, with the Red Sox losing 10 consecutive games to the Yankees from 1918 to 1919. In the context of other sports, the NBA's longest losing streak to a single opponent is the 33 losses in a row by the Cleveland Cavaliers against the Los Angeles Lakers from 1970 to 1974. Such streaks highlight the dominance one team can have over another in competitive sports.