The long-awaited clash of the two undefeated holders of all the heavyweight gold is finally happening.
Briton Tyson Fury and Ukrainian Oleksandr Usyk were supposed to meet back in March, but an injury to Usyk in training meant a delay till now.
Between them, there is a veritable alphabet of titles, but the best way to describe this is that the winner will become the first undisputed heavyweight world champion since Lennox Lewis in 2000.
The build up to this card, billed as 'Ring of Fire', has been full of the usual Fury antics and Usyk stoicism, however things reached a boiling point this week when John Fury, Tyson's father, head butted one of Usyk's entourage in a pre-fight press conference.
Usyk landed a bit of a psychological blow by pointing out that Fury had lost a fair bit of weight for the fight, which is a fair point given Fury's size has always been a significant advantage throughout his career. Both men had to be separated by security at the pre-fight weigh in.
It is also a big day for Kiwi cruiserweight David Nyika, who is fighting German Michael Seitz on the undercard, as well as a big day for Fury and Usyk's bank accounts with the main event purse rumoured to be somewhere about $200 million.
Here is the tale of the tape:
Tyson 'The Gypsy King' Fury
Record: 34-0-1 (24 KO)
From: Manchester, England
Age: 35
Height: 6'9" (206cm)
Reach: 85" (216cm)
Weight: 262 pounds (118.8 kg)
Fury is back in the ring once again after retiring at least twice, continuing a remarkable career that has seen him become world champion and be involved in some of the most memorable fights of the last decade.
His larger-than-life personality often dominates the headlines, however it unfairly obscures the fact that Fury is an incredibly skilled ring tactician.
He uses his size to great effect, often dropping his left hand to invite the jab, before swiftly evading and countering.
Fury moves his head in an unorthodox fashion making it even harder to get to on top of the height difference he usually enjoys, while also employing some cunning tricks like a headlock while both fighters are in a clinch.
Oleksandr Usyk
Record: 24-0 (14 KO)
From: Simferopol, currently disputed territory between Russia and the Free State of Crimea
Age: 37
Height: 6'3" (191cm)
Reach: 78" (197cm)
Weight: 233.5 pounds (105.9kg)
The 2012 Olympic gold medallist is coming in with a formidable record after waiting patiently for this massive occasion. Usyk had dispatched Daniel Dubois and Anthony Joshua twice in his last three fights, firmly putting him in the main contender bracket, and has long been seen as a man who can unify the heavyweight titles.
His style is an uncommon right-handed southpaw stance, having his jab on his strong hand meaning he can throw it harder, faster and more accurately.
Usyk is a busy fighter, gauging distance constantly and using his timing to disguise his power punches and get through guards. This sort of constant movement is aimed at disrupting opponents' movement and forcing them into a high work rate at the outset of a fight.
Full fight card
Main Event: Heavyweight: Tyson Fury vs Oleksandr Usyk for the IBF, WBA, WBC and WBO titles
Cruiserweight: Jai Opetaia vs Mairis Briedis for the vacant IBF title
Super featherweight: Joe Cordina vs Anthony Cacace for the IBF title
Heavyweight: Frank Sanchez vs Agit Kabayel
Heavyweight: Moses Itauma vs Ilija Mezencev
Lightweight: Mark Chamberlain vs Joshua Wahab
Light heavyweight: Sergey Kovalev vs Robin Sirawn Safar
Light heavyweight: Daniel Lapin vs Octavio Pudivtr
Cruiserweight: David Nyika vs Michael Seitz
Featherweight: Isaac Lowe vs Hasibullah Ahmadi
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