Golovkin first made his name in the amateurs, where he ran up an impressive resume winning various international competitions and beating numerous fighters who would later leave their mark on the professional scene. As a professional his career was a relative slow burn for his first 18 bouts, all in Europe. He claimed the WBA Interim Middleweight title in 2010 and since then he has become one of boxing's break out stars racking up world title defenses for fun and unifying the WBA, WBC, IBF and IBO titles in a career that has seen him become a star in America.
In the build up to a Golokin bout the typical thing to mention is his power. With a 91% stoppage rate the power is intimidating and it has seen him stop his last 22 opponents, including fighters like Daniel Geale, Marco Antonio Rubio, Martin Murray and David Lemieux. The power however is only part of the story with Golovkin's real strength actually being his skills. Those skills allow him to cut the ring down, get in to the range to land those powerful shots and break opponents down. He does have 1-punch KO power, as Nobuhiro Ishida and Lujan Simon found out, but the key to his power is that every single shot hurts, and eventually they break opponents down.
Unlike many power punchers Golovkin doesn't depend primarily on his power but instead uses his power as one of many weapons along with his timing, foot work, intelligent pressure and shot selection, including his now well known under-cut or sledgehammer shot. There are holes in his game defensively, and one wonders how he'd cope with someone crowding him and smothering him, but those holes are very hard to exploit.
For Brook the bout sees him making his Middleweight debut. He is well known for his career at Welterweight, where he has beaten the likes of Shawn Porter, Matthew Hatton, Vyacheslav Senchenko and Carson Jones, twice. Although highly skilled Brook's career has been an incredibly frustrating one with the last few years spent defending the IBF Welterweight title against very poor opponents, like Jo Jo Dan, Frankie Gavin and Kevin Bizier, who lasted a combined 12 rounds. Given the depth at Welterweight Brook had the chance to make himself an international star but has really wasted that chance with various problems.
In the ring Brook is a fantastic boxer-puncher. He shut down Porter with a disruptive game plan, destroyed Gavin, Dan and Brook with his power and gritted out a decision over Jones in the first bout. Not only is he a great boxer-puncher but he's also a massive Welterweight, and is probably a natural Light Middleweight. That however leaves us wondering how he will be at Middleweight, and we have seen him hurt by shots at Welterweight, with Senchenko wobbling him and Jones almost stopping him late in their first bout.
Tactically Brook has to be spot on to survive here. He has to neutralise not just the natural power and strength of Golovkin but also his pressure. That might mean that Brook has to, essentially, hit and run and run and run. Or it might mean that Brook, who has beefed up for the fight, has to get in and smother Golovkin, rather than let the Kazakh have full extension on his shots.
We suspect Brook will be confident coming in to this one and will feel he has done every thing he can to prepare for the bout with a solid gameplan. That plan however will likely go out of the window when he feels the power of the Kazakh and in the middle rounds that power will be too much, eventually stopping the challenger who will have taken some serious punishment before wilting.