Tyson Fury maintained his unbeaten record (29-0-1, KO 20)in the heavyweight division following his unanimous points decision victory over Swede Otto Wallin in Las Vegas on Saturday night, but the Brits’ father John Fury reckons his son was extremely “lucky”.

The furious Senior Fury went on a scathing attack on his son’s performance, blaming the 31 year-old’s corner for the uncharacteristic show by the Gypsy King.

John Fury told BT Sport: “I’ve never seen him as bad.

Despite the win Linear Champion Tyson Fury suffered a massive cut and fought most of the bout with his vision severely impaired – he missed his post-match presser as he was taken to hospital.

“He looked weight-drained, he looked like he’d left it all in the gym to be honest with you,” his father said.

“From the second round on there was no snap, there was no real movement, there was no real thought going into his work.

“It was just a laboured performance, and then the good happened, he’s a lucky man to get the win to be honest, very lucky indeed.

“With a cut as bad as that, what was it, the third round? I don’t know how he got to the twelfth.

“I just think he’s a very lucky chap to emerge the winner. But that’s not Tyson in there, I know that.

“Whatever’s gone wrong in that camp, which it has gone wrong, somebody’s to blame and he just to me looked like he didn’t have any strength from the off.

“His timing was off, his distance was terrible, he didn’t look for the body.

“He never threw a meaningful shot really and the only ones thrown were like laboured off flat feet, hoping to connect and get him out of there.

“Whether Wallin is a lot better than I can see on the television, but to me he was no better than his last opponent [Tom Schwarz] to be honest with you, because he never had the skill to capitalise on it.

“If he’d have been in front of any other man tonight, either Wilder, Ruiz, any of them top three, he wouldn’t be coming away the winner.

“Even Povetkin, he wouldn’t have beat Povetkin on that performance tonight.

“I’m being honest about it, he’s my son, I’m a straight talker, that’s the worst I’ve seen my son.

“But what I can say? I’m very proud of the way he mauled his way through it, he showed world class heart and he will come again.

“He needs to go back to the drawing board and see what’s gone wrong here. And be honest to look in the mirror and say, ‘Things ain’t gone right.’

“He needs to look where he’s gone wrong. I’ve half an idea, but that’s for my own.”