Just as terms for Tyson Fury and Anthony Joshua were finally approved by the lawyers and US promoter Bob Arum declared the fight official, so a judge has plunged the Saudi megafight back into doubt.

The legal mediator ruled that Fury must go through with his contracted trilogy fight with Deontay Wilder by September.

The showdown for the undisputed heavyweight championship of the world was given the green light by lawyers for Fury and Joshua.

Written guarantees for the two giants of the British ring to receive $45 million each from the Saudi Arabian hosts for their August 14 spectacular were finally forthcoming.

Bob Arum, Fury's US promoter, came off a conference call with his UK partner Frank Warren and their legal teams to announce here: 'Now the fight is definitely on.' So ended months of wrangling.

Arum is expecting a mediating judge to release Fury from his contracted trilogy fight with Wilder, even if that involves compensation for the American power puncher from whom the Gypsy King took the WBC world title.

Agreement has also been reached in principle for a rematch, with Arum saying; 'That is likely to be in December under the roof of the stadium in Cardiff.'

The purses for Fury and Joshua are expected to rise closer to their original expectation of $100 million each through pay per view TV rights shared in the UK between BT Sport and Sky Sports.

Arum has said a provisional stand by date for Fury v Wilder has been held for some time for July 24 in the United States.