Topic summary
Best-of-nine playoff

Extracted from the Wikipedia article Playoff format.
Best-of-nine playoff
A best-of-nine playoff (also known as a first-to-five playoff) is a head-to-head competition between two teams in which one team must win five games to win the series. Five is chosen as it constituted a majority of the games played; if one team wins the series before reaching game 9, all others are ignored.