LAS VEGAS – Eddie Hearn cannot envision a scenario in which a third Canelo Alvarez-Gennadiy Golovkin fight goes all 12 rounds.

If Alvarez defeats Dmitry Bivol in their light heavyweight title fight Saturday night at T-Mobile Arena, he and Golovkin will finally fight a third time September 17 at a venue to be determined. The completion of their trilogy would be contested at the super middleweight limit of 168 pounds, eight pounds higher than their first two fights.

Hearn – whose promotional company, Matchroom Boxing, will begin a three-fight deal with Alvarez on Saturday night – broke down the potential third meeting between Mexico’s Alvarez (57-1-2, 39 KOs) and Kazakhstan’s Golovkin (42-1-1, 36 KOs).

“I think it’s a different fight this time,” said Hearn, who also pointed out that Alvarez has a difficult fight ahead of him Saturday night. “I don’t think it goes eight or nine rounds. I think both guys – I think Triple-G will say, ‘This is probably my last fight, if I lose. And I’m gonna go out there and’ … And by the way, I think he will be so much better at 168 than 160. How long has he been at 160, fighting [at] championship weight? Fourteen years at 160. I mean, he will be so much better and so much stronger at 168. He will be very aggressive in that fight. He’s a slow starter, and when he was out for 440 days or whatever he was, he started really slow in Japan [against Ryota Murata].

“He also went to the champion’s backyard, having not boxed for 440 days, had a bad opening few rounds, and then went through the gears and beat him up. I actually didn’t mind the performance. He will be very aggressive against Canelo because he ain’t gonna try and fiddle around for 12 rounds. And Saul will wanna take his head off. I promise you that fight won’t go the distance because Saul, not speaking out of turn, will wanna hurt him.”

A day after his 40th birthday, Golovkin got off to a slow start in his middleweight title unification fight with Tokyo’s Murata on April 9 at Saitama Super Arena in Saitama, Japan. Once Golovkin took some damaging body blows from Murata, he eventually got into a rhythm offensively and broke down the former WBA 160-pound champion.

Golovkin knocked Murata to the canvas in the ninth round, when he stopped Murata (16-3, 13 KOs) and secured his place in a third fight versus Alvarez.

The 31-year-old Alvarez, who Caesars Sportsbook has listed as a 5-1 favorite over Bivol (19-0, 11 KOs), understood Wednesday why he was asked about battling Golovkin again almost as much as boxing Bivol in a 12-round, 175-pound championship match DAZN will distribute on pay-per-view ($59.99 for subscribers; $79.99 for non-subscribers).

“I just do my job,” Alvarez said. “I have something to work on Saturday night, and then if Golovkin comes, I don’t care. I’m ready.”

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.