the best of three, five, etc.
(the) best of (an odd number)
A victorious outcome determined by the person or team who wins the majority of an odd number of games (three, five, seven, etc.). I love the Stanley Cup Playoffs more than other sports championships because the fact that's it's the best of seven means a team can have an off day but still rally to win the whole thing. A: "Fancy playing a round of tennis." B: "Sure! Best of five?"
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
the best of ˈthree, ˈfive, etc.(especially in games and sports) up to three, five, etc. games played to decide who wins, the winner being the person or team that wins most of them
See also: of
Farlex Partner Idioms Dictionary © Farlex 2017