Follow the fight LIVE here.
Kell Brook will attempt to do the seemingly impossible and stop Gennady Golovkin, taking his WBC and IBF middleweight titles, at the O2 Arena on Saturday 10 September.
Where to watch
Golovkin vs Brook is available to watch live on Sky Box Office. The card for the evening gets underway at 5.30pm [BST] with the main event not expected until approximately 10.30pm.
There aren't many fight announcements that provide the genuine, tangible surprise felt like when Brook vs Golovkin was unveiled on a quiet Friday afternoon in July.
The Sheffield-born fighter sent a shockwave trembling through the welterweight division when he defeated Shawn Porter in the American's own backyard in August 2014, becoming the first Briton to win a world title in the United States in 28 years. Suddenly, doors were opening up in front of him. Bouts with Floyd Mayweather and Manny Pacquiao were being touted, as was a long awaited showdown with long-term adversary Amir Khan.
But after the triumph of his title victory, Brook's three title defences failed to get the juices flowing. Wins over Jo Jo Dan, Frankie Gavin and Kevin Bizier were as routine as they come, and the need for a greater test was desperately needed.
That looked to be developing as talks with WBO champion Jessie Vargas mounted. Instead, the boxing bombshell of the year was dropped when it was announced Brook would step up two weight divisions to take on the most feared fighter on the planet.
Golovkin had been vying for a unification bout with Saul 'Canelo' Alvarez, having become the mandatory challenger for the Mexican's WBC belt. Instead of taking the fight, Canelo relinquished the title, temporarily crushing plans for what many would have seen as the biggest fight that can be made right now.
Many will argue Canelo simply ducked the challenge; one Brook eagerly snapped up. Make no mistake, a win for Brook on Saturday would be the biggest British victory inside the ring in boxing history. But the weight of the challenge at hand is colossal. Golovkin has built a career on ending fights early. Only three of his 35 professional fights have gone the distance. It's been eight years since we last heard the final bell in one his bouts, his last 21 ending with an early stoppage. An average knockout rate of 91% is good enough to be the best in the history of middleweight boxing. Throughout his amateur and professional career, he has never been knocked down. His record in the ring is unblemished.
It's a frankly ridiculous set of statistics and records that see many regard Golovkin as the best pound-for-pound fighter on the planet. Somehow, Brook has to find an answer to it.
What they have said
Golovkin: "Kell is a champion and I respect him. I saw a couple of his fights. He has different speed, different movement and different timing. It's not easy. Yes, it's a different size for us, I'm a little bit bigger, but right now I can't say he's an easy fight for me because he's a very good fighter." [via Sky Sports]
Brook: "I looked into his eyes and I could see fear. He knows he's in a real fight on Saturday night and it can't come quick enough. I just feel he's on edge and uncomfortable. He knows it's my time and he can see in my eyes that I want to shock the world. I'm a natural at this weight and I can't wait to show the world what I can do."
Golovkin: 35 fights, 35 wins (32 via knockout), 0 defeats
(W) Dominic Wade – knockout – April 2016
(W) David Lemieux – technical knockout – October 2015
(W) Willie Monroe Jnr – technical knockout – May 2015
Brook: 36 fights, 36 wins (26 via knockout), 0 defeats
(W) Kevin Bizier – technical knockout – March 2016
(W) Frankie Gavin – technical knockout – May 2015
(W) Jo Jo Dan – referee technical decision – March 2015
Brook's flawless career record with be brought to an end. Golovkin is simply the best in the world at what he does. Knockout victory for the Kazakh inside five.