Amir Khan was knocked out inside the first minute of his WBO intercontinental lightweight title defence by Colombia's Breidis Prescott.

Khan was put down for the first time after just 30 seconds when he was hit by two lefts in quick succession.

The 21-year-old managed to regain his feet but was clearly struggling.

He resumed after an eight count but Prescott unleashed another flurry of punches and Khan hit the deck once more before being counted out.

Going into the fight there were suggestions that the big-punching Prescott would provide a stern test of Khan's much-criticised defence, and he had rocked the Bolton fighter within seconds of the start.

A stiff jab snapped Khan's head back and he was soon caught by a crisp left hook.

Khan managed to absorb a right hand but was then caught by a second left hook from Prescott and his legs buckled before he hit the deck.

It looked as though he would struggle to beat the count as his legs threatened to go from under him, but he managed to convince the referee he was fit to continue after taking a full eight count.

But when the bout resumed he immediately walked onto a right hand from Prescott and another right and left from the Colombian was enough to send Khan crashing and ruin his unbeaten record.