Mike Tyson admitted he did not back Anthony Joshua to produce his stunning win over Wladimir Klitschko at Wembley but says in being proved wrong the British star has ‘changed boxing’.

‘It was a great fight,’ Tyson told ESPN. ‘I had actually picked Klitschko to win as I thought this was just some jumped-up young guy from England. But man he fought well. Klitschko is 41 and no-one has ever done that to him.

‘Importantly, he showed heart. He took a big punch from Klitschko and went down but he got back up. He showed real intestinal fortitude.’

It was a great fight,’ Tyson told ESPN. ‘I had actually picked Klitschko to win as I thought this was just some jumped-up young guy from England. But man he fought well. Klitschko is 41 and no-one has ever done that to him.

‘Importantly, he showed heart. He took a big punch from Klitschko and went down but he got back up. He showed real intestinal fortitude.’