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The world's leading trainer believes Amir Khan can succeed in upsetting Terence Crawford - even though he considers the American the finest fighter in the world.

Khan challenges the great WBO welterweight champion at New York's Madison Square Garden on Saturday in what could prove to be his defining fight.

Trainer Freddie Roach is as familiar with Khan, having once trained him at his famous Wild Card gym, as he is with the level Crawford is competing at after inspiring the great Manny Pacquiao to his peak years.

Fights with Pacquiao and Floyd Mayweather previously eluded Khan when he hoped to challenge one of the world's two leading fighters, but this weekend the opportunity the 32-year-old from Bolton has desperately wanted finally arrives.

"Khan can pull off the upset if he fights the right fight," Roach said.

Crawford is among the best pound-for-pound fighters in the world. He became the undisputed junior welterweight champion in 2017 before making the move up to welterweight, and he won a major title there when he dispatched Jeff Horn in June. The Nebraskan then delighted his home fans with an emphatic 12th-round KO of Jose Benavidez Jr in a grudge match. Khan is a former world champion himself, albeit not at welterweight. He is known for his hand speed, boxing skills, but also a shaky chin that has been found by several opponents. Khan comes in as a heavy underdog primarily for the chin issue, and also because Crawford is in the prime of his career and looks nearly unbeatable. One thing we do know is that Khan is never in a boring fight, so he’ll surely give it a good effort win or lose.

Amir Khan will look to become the only man to beat Terence Crawford when he steps in the ring with the unbeaten American this weekend.

The pair meet in New York on Saturday night with the American's WBO welterweight strap on the line.

After a year away from boxing and a profile-boosting appearance on hit ITV show I'm a Celebrity... Get Me Out of Here, Khan returned to the ring with back-to-back wins over Phil Lo Greco and Samuel Vargas but faces a mammoth task when he takes on Crawford.

The current WBO holder is unbeaten after 34 professional fights, a three-weight world champion and is seen as one of the pound-for-pound greats of the sport.