Former world super-middleweight champion Joe Calzaghe has tipped Amir Khan for a points victory over Devon Alexander this evening.

Khan squares off against the American in Las
Vegas in the early hours of Sunday morning, and the Bolton-born fighter will be looking to impress to strengthen his claims for a showdown with Floyd Mayweather Jr.

Calzaghe is in Vegas for the fight, and the Welshman, who retired unbeaten back in 2009, has backed Khan to emerge victorious.

The fight will be Khan's second at the 147lbs weight class.