More like a battle royale free for all than a tournament.
It all started after chapter 801 when Doflamingo called the Throne Wars:
- He was the first victim
- Then Bege technically
- Then Hawkins, Apoo, Drake, BM and Kaido
- Then technically Hancock (lost to BB), Weevil (lost to Aramaki), and Kuma (lost his mind lol), and Bonney.
- Now you have Kid and presumably Law.
- By the end of Egghead, you will probably remove Kizaru at least.
Still leaving:
- Blackbeard, Shanks, Mihawk, Buggy, Urouge, Luffy and Zoro on the Pirate side.
- Akainu, Fuji and Ryo on the Marines side
- Dragon, Sabo and his commanders on the Revo side.
- Likely Im and his Gorosei (not referenced here but also Im was not revealed by this point) on the WG side.
Urouge probably is like Bonney and Bege and relevant to a future plotline by arc In the least, and the rest of those eliminated will probably still be relevant in the endgame, but these are what is left.