The first saw Golovkin look for a KO from the opening seconds and he buzzed Brook in the opening moments. Brook however bit down on his gum shield, showed his cojones and started to fight back. The Englishman had success in the later stages of the opening round and then build on that success with an excellent effort in round 2, landing some nasty shots including a vicious uppercut whilst taking advantage of Golovkin's wreckless aggression. Despite the success of Brook in round 2 he did appear to suffer some facial damage with the fighter himself suffering a pretty clear eye injury.
In round 3 Golovkin stepped it up and really started the round aggressively with some damaging shots to Brook in the first half of the round. The second half of the round saw Brook again boxing well, settling to the task at hand with some solid shots. Again Brook grew success from success and in round 4 the Englishman again had some genuine moments as his confidence built, though he was forced to take some bombs, including a monster on the bell.
In round 5 Golovkin got off to a fast start and hurt Brook early in the round before landing shot after shot. Brook remained on his feet but took a pounding with his corner trying to pull their man out. Golovkin continued to land until the referee finally saw Brook's corner waving the towel and stepped in.
The Kazakh destroyer didn't look his best. From the off it looked like he lacked respect for Brook, launching ridiculously stupid shots at the Englishman and not using his footwork or his jab properly. Brook was quick on his feet in the early stages but when Golovkin finally got his boxing together, in round 5, the bout looked very one sided.
For Brook the loss will be a set back, however it will be one that he will get serious praise from. He will likely continue his career at 154lbs and will almost certainly have notable success going forward, if the injury to his eye isn't too serious long term