Saul 'Canelo' Alvarez and his coach Eddy Reynoso are one of the most successful duos in boxing history.

The Mexican star, 31, rocked up at Reynoso's gym in Mexico as a scrawny teenager after watching his older brother Rigoberto make his debut as a professional boxer.

Canelo Alvarez became the Junior Mexican National Boxing champion in 2005 at the age of 15.

However, the Reynosos were unable to find suitable junior opponents for him because of his experience as an amateur.

That left him turning professional aged 15, winning his debut against Abraham Gonzalez with a fourth-round stoppage.

The pair have pretty much blown away all the competition since then - except for Floyd Mayweather of course - with a combined haul of 15 major world championships including all five super-middleweight titles between them.

And now an incredible epic montage by ESPN has been released showing Canelo training under the watchful eye of Reynoso at the House of Boxing gym in San Diego, California.

WATCH: Are Canelo Alvarez and Eddy Reynoso the best boxer-trainer duo in boxing?

Check out the video below...

The undisputed super-middleweight world champion returns to the ring on May 7 at the T-Mobile Arena in Las Vegas to challenge for the WBA light-heavyweight title against Dmitry Bivol.

Now ESPN have paid tribute to the Mexican and his coach with a 31-second compilation ahead of his clash with Bivol.

It begins with Alvarez walking into the gym past a punching bag with 'No Boxing No Life' on the front of it before showing the star getting his hands wrapped before he starts to work up a sweat with his coach in the corner.

The video then skips to Canelo putting on his gloves before the training session gets underway.

Alvarez is then shown in the gym hitting the pads as before striking the same bag as shown at the start of the clip before it ends with the fighter walking away leaving his gloves on the floor.

Reynoso's father Chepo, who also coaches Canelo, spoke highly of the duo in an exclusive interview with DAZN last year.

He previously said: "16 years as a professional, 17 years training, working hard. It sounds very little but it is a lot of hours, many days, many months and years. Rain or shine he is working there and now he is reaping the rewards of so much hard work.

"People think it's easy to get here, but they're wrong. It takes a lot of hard work. We are a disciplined and demanding team in training, so he got used to it.

"He arrived as a mass and we were making our own mould. Everything he knows he learned from us, we were always disciplined, responsible, our gym never closed, whenever he arrived there was his gym, so all of that is what has made him get to where he is. Discipline, because we are also disciplined."