Gennady Golovkin vs. Kell Brook, was a professional boxing match contested on 10 September 2016, for the WBC, IBF, and IBO middleweight championship.

The event was televised live on Sky Sports Box Office in the UK and HBO in the United States.

Golovkin won the fight in round 5, after Brook's corner threw in the towel.

On 8 July 2016, it was announced that Gennady Golovkin would fight Kell Brook on 10 September 2016 at the O2 Arena in London, England.

Although they granted Golovkin a special permit to take the fight, they stated that their title would not be at stake.

The Golovkin camp were said to be disappointed with the decision with promoter Tom Loeffler saying, "somehow the WBA thought it was too dangerous for a welterweight to move up to middleweight to fight the biggest puncher in boxing.

I guess that is a compliment to GGG as they sanctioned [Adrien] Broner moving up two divisions [from lightweight to welterweight] to fight Paulie [Malignaggi in 2013] and Roy Jones moving up two divisions [from light heavyweight to heavyweight] to fight John Ruiz [in 2003] for WBA titles, and Kell Brook is undefeated and considered a top pound-for-pound boxer.

He was met with stiff resistance as Brook began to fire back, connecting multiple clean combinations on Golovkin, none of which were able to faze him.

In the second round Brook had his greatest success of the fight, but in the process had his right eye socket broken.

Brook showed courage, determination and a great chin as he absorbed the bulk of a Golovkin onslaught.

Despite this, Brook's trainer Dominic Ingle threw in the towel to protect his fighter's damaged right eye, ending the fight in the fifth round with both boxers still standing.

A replay was shown later in the evening as part of the world super flyweight title fight between Roman Gonzalez and Carlos Cuadras.