In Game 4 of the 1999 American League Division Series, the Red Sox routed Cleveland 23-7, forcing a deciding Game 5 in Cleveland on October 11.
Pedro Martinez posted a 2.07 ERA during a season in which the majors' average ERA was 4.71. Cleveland lineup's had scored 1,009 runs, one of only seven teams in the modern era to top 1,000 runs - and the only one since 1950.
Ian Browne has an oral history of that game:
Martinez: I thought I did something bad [in Game 1] because I heard it.