By Alexander Gordopolov

The biggest fight in boxing is still being negotiated for next September. Golden Boy Promotions and K2 Promotions are still working out the terms for an HBO Pay-Per-View fight between IBF, WBC, WBA, IBO middleweight champion Gennady 'GGG' Golovkin (36-0, 33KOs) and Mexican superstar Saul 'Canelo' Alvarez (48-1-1, 34KOs).

Former light heavyweight champion Sergey Kovalev was at one time a training stablemate with Golovkin. They used to train side by side with coach Abel Sanchez at Big Bear in California. Kovalev would eventually leave and hire the man who currently trains him, John David Jackson.

Kovalev was also present when Golovkin and Canelo traded punches during a sparring session.

In the opinion of Kovalev, the fight is very even and he felt Canelo held his won against Golovkin, and Olympic silver medal winner with a very impressive amateur record.

"Golovkin is a real threat, but Canelo is also good. My bet on this fight - it's 50-50. If the fight takes place, it will go the entire distance, and there will probably be a war of intelligence. In other words, it's going to be a chess match," Kovalev said.

"I can tell you that when I trained in Big Bear, I can remember watching Golovkin and Alvarez sparring. I worked there for a year and half in that gym, where Gennady had been staying as well. We trained together. So I've seen the sparring between Golovkin and Alvarez. They were both very competitive. Neither one was inferior to the other. As far as what happens in the present - it really all depends. Gennady tends to have shorter fights, as he quickly destroys his opponents. And Alvarez tends to go a lot longer in his fights, but his opponents are stronger than those of Gennady."

Alexander Gordopolov covers boxing for tofight.ru