Tyson Fury says his world heavyweight title showdown with Anthony Joshua will take place in Saudi Arabia on 14 August.
The all-British bout has been billed as one of the biggest in heavyweight boxing for decades and the winner will become undisputed champion.
Joshua, 31, holds the WBA, WBO and IBF belts, while Fury, 32, is WBC champion.
The fight will see all four belts on the line in a heavyweight bout for the first time in history.
The last undisputed heavyweight champion was Britain's Lennox Lewis from 1999 to 2000, in an era when fighters did not need to hold the WBO belt to be recognised as undisputed champion.
In announcing the fight date in a video on Twitter, Fury said: "All eyes of the world will be on the Kingdom of Saudi Arabia and I cannot wait to smash Anthony Joshua on the biggest stage of all times.
"This is going to be the biggest sporting event ever to grace the planet earth. Do not miss it."
Plans for a fight between the pair were set in motion when Fury defeated Deontay Wilder to capture the WBC title in February last year.
