Amir Khan has lost his first fight as a professional boxer, and the whole fight took just 54 seconds!
His opponent Breidis Prescott rocked Khan with almost the first punch of the bout, and knocked him to the floor.
Khan fought back to his feet, but Prescott leapt back in to knock him to the floor for a second time and end the fight inside the first round.
It was Khan's 19th fight since winning a silver medal at the Olympic Games four years ago.
After the fight Khan was okay, and said: "I knew he had speed and was powerful. I will have to see where I'm going wrong but I will be back stronger."
It was a very tough fight for Khan, as Prescott also had an unbeaten record before the bout.
He had won 17 of his 19 fights by knocking out his opponent, and now he looks like he's going to be a boxing star of the future.