Major League Baseball
In the Division Series, teams play "best out of 5". Once one team beats the other three times, the winning team moves onto the next round of the playoffs, the Championship Series.  The teams that lose are out of the playoffs. The AL teams that win play in the AL Championship Series. The NL teams that win play in the NL Championship Series. The Championship series is "best out of 7 games". Once one team beats the other four times, the winning team moves onto the next round of the playoffs. After the Championship Series, there are only two teams left.