Gennady Golovkin and Kell Brook put one one of the greatest fights the British shores have seen in decades as both men attacked each other from the first bell and the challenger troubled Golovkin like precious few men have.
There were five brutal and exciting rounds and while Brook may have realised he is not a middleweight, he certainly proved he is a world-class fighter.
Golovkin staggered Brook in the first round, but the Sheffield-born fighter responded well with a few well-timed combinations in the dying embers of the opening round.
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Brook responded with a fantastic second round on the front foot and certainly took the round. The 02 Arena roared as the Special One showed no fear of GGG's power, despite his first-round rocking.
For the first time, London began to believe they might witness something incredible.
The third round was like a Rocky movie. Both men rattled each other with huge hooks to draw blood; Golovkin had an unaccustomed nose bleed and Brook suffered a cut above his eye.
In the fourth, GGG began swinging wildly looking for the big shot to put Brook to bed. He was unable to do so as Brook incessantly circled the ring inviting the Kazakh fighter to chase him, countering him at every opportunity.
However, at the beginning of the fifth round, Golovkin began to dominate and started throwing bomb after bomb that virtually no man could withstand.
Credit to Brook, he did not run. His trainer ended up throwing the towel in as the IBF welterweight champion's eye looked in serious danger. In his post-fight interview, Brook suggested he had a broken eye-socket.
The Englishman showed the character and courage that he possesses and unlike many fighters, he did everything he said he would. The power and natural weight simply got the better of him, but he attacked with purpose and leaves the ring without being knocked down or another Youtube highlight clip.
GGG knows he was in a fight, but, his reputation as the most powerful puncher in the world remains intact and clear for all to see.