Trivia: What World Series was the last one to feature a best-of-nine format?
1903
1921
1954
1994
Correct Answer: 1921
So why is this answer correct? : While the first World Series in 1903 was conducted under a best-of-nine format, the best-of-seven format we know today first appeared at the 1905 Fall Classic. The best-of-nine structure eventually returned between 1919 and 1921. But when attendance numbers began to substantially drop between Games 7 and 8 of the 1921 World Series, the best-of-seven format was brought back the following year.