Homerun Clash has 5 different types of rankings. The criteria for each are listed below.

My League – Decided by the amount of league points acquired through 1vs1 matches.
Global Rankings – Decided by total number of World Points possessed.
Nation Rankings - Decided by the total number of World Points acquired by the Top 50 members of each nation.
Clan Rankings - Decided by the total number of Clan Points acquired by all clan members during Clan Battle.
Friend Rankings – Decided by total number of trophies possessed.

In cases where the amount of trophies and/or points are the same, the game will internally apply additional criteria to determine the rank.