Saul Alvarez and Amir Khan go head-to-head (Getty)

Saul Alvarez knocked out Amir Khan with a brutal right hook in the sixth-round to retain his WBC middleweight title at the T-Mobile Arena in Las Vegas.

Khan stepped up two weight divisions to face the fearsome Mexican, and despite an impressive start, in which the Brit could have claimed to have won the first four rounds, Alvarez soon found his range, and clinically ended the fight in the sixth with the devastating right.

The ring walk was at 4.15am

Khan now has a record of 31 wins with 4 defeats in 35 bouts

Alvarez has lost only once in 49 fights – to Floyd Mayweather

Khan had odds as long as 4-1 to win before the bout

Read how this intriguing contest unfolded below:

At Friday's weigh-in, both men scaled 155lb, right on the catch-weight limit.