"The team that wins two-thirds of its one run games usually wins the pennant"

This quote by Pete Rose is referring to the importance of winning close video games in baseball. A group that can win two-thirds of its one run games is most likely to be successful in the long run. This is due to the fact that close video games are frequently chosen by a single play or a single error, and a team that can regularly win these close video games will have an advantage over its challengers. Winning two-thirds of one run games suggests a group that is well-prepared and has the capability to perform in the clutch. This is why groups that can regularly win close games are normally the ones that end up winning the pennant.