Yes! There is a Duel System in War Pirates, where every Captain can test the ability of their fleet against other players while Grand Arena had 3 rounds battle were ship formation is a key.
It is divided in 2 Modes, Duel and Grand Arena.
Participating in Duel automatically adds you to the Weekly Rankings. Where you get rewarded for the rank you reached after the weekly reset.
For Grand Arena Ranking you will get Grand Arena Points depending on your Rank. Changes in Ranking is every Sunday 23:00 server time.