Terence Crawford and Canelo Alvarez have agreed on who they believe to be the greatest fighter in boxing history.

The modern pound-for-pound greats are set to face off in a mega-fight on Saturday September 13 at the Allegiant Stadium in Las Vegas, Nevada.

Canelo will make a defence of his undisputed super-middleweight championship against ‘Bud’, just months after he achieved this feat for the second time in his career with a victory over William Scull.

Crawford has set his sights on writing his own name into boxing history once again, as victory over the Mexican star would see the 37-year-old from Omaha become the first male fighter in boxing history to win an undisputed championship in three weight classes.

It’s a test of the highest magnitude for ‘Bud’ however, as he makes the jump up in two weight divisions from his last outing at 154lbs to face the Mexican icon, after having spent the majority of his recent years campaigning at 147.

Both men have a case as the best of a generation, but who do they consider to hold that title for all time?

In a round of Quickfire questions with ESPN Ringside, Canelo and Crawford were asked to reveal who they believe is the best boxer ever, naming none other than late-great heavyweight legend Muhammad Ali.

Ali, commonly known as ‘The Greatest’, is often regarded such. He helped shape the landscape of the heavyweight division throughout the course of his tenure, defeating an abundance of generational greats including the likes of Ken Norton, Earnie Shavers and Joe Frazier.

His 1974 ‘Rumble in the Jungle’ showdown with George Foreman remains one of the most memorable moments in boxing history. Outside of the ropes, Ali was equally as influential, with his social and racial campaigning and outspoken opposition to the Vietnam war making him a household name.