A heavyweight showdown between Tyson Fury and Anthony Joshua is still not inked in the schedule, but the battle to host it is taking shape.The Athletic has been told by sources with knowledge of negotiations, speaking anonymously to protect their positions, that Las Vegas has emerged as a front runner to host the bout, with other American cities under consideration.But there is no deal in place yet and crucially, as The Athletic reported last week, Joshua’s contract for the long-awaited fight states the bout must take place in the UK.That would need to be renegotiated in the coming weeks for the fight to happen in the U.S. but those close to negotiations have not ruled out the possibility.It is the latest mess surrounding a fight which has been in the works for around eight years. We take a look at why it is now a U.S. v UK battle for the bout.What needs to happen for Fury to fight Joshua and when would it happen?The figures involved in setting up the fight are Saudi boxing powerbroker Turki Al-Sheikh, Ring Magazine and Saudi entertainment group Sela as well as broadcaster Netflix. Frank Warren’s Queensberry Promotions and Eddie Hearn’s Matchroom are also involved.There is widespread confidence that the fight will happen, should Joshua and Fury come through warm-up bouts this summer unscathed.What is outstanding is its date and location, although the latter is now the most important part of the discussion.Previously, Wembley Stadium in London was considered to be the preferred location but the timing of the fight is also relevant to where it is staged.