The ranking is global and is based on the amount of trophies you have earned!
How can I check the Global Ranking?
To check your raking, tap on the trophy icon on the top of your main screen.
The list will open right on your place in the global ranking. You can tap on any player name to check their profile. By doing so you can compare which line-up (set of items) they have equipped and maybe get a little inspired for your next match!
What if there's a tie between players?
In a situation where players have the same numbers of trophies, the tie breaker will be the win streak!