It's not often that professional boxers praise the performances of their opponents.

But British fighter Anthony Joshua has done just that, judging his rivals' knockouts in a short video shown on Sky Sports today.

Sat with Dave Alorka, best known from Cheeky Sport TV, the IBF, WBA and WBO Heavyweight Champion first discusses Tony Bellew's knockdown of David Haye last year.

Bellew put Haye on the floor in the fifth round with a lethal left hook to win the fight.

And Joshua commented, “It was interesting because I thought he (Bellew) was so underestimated, especially by David Haye.

“And then he went in there and did that. That was an unbelievable left hook.

“Bellew is very underestimated.”

Next up was Amir Khan's lightning quick destruction of Phil Lo Greco last April. It was the Bolton-born fighter's first bout in two years, but he showed no signs of rustiness as he put Lo Greco away in just 40 seconds.

Not that Joshua was too impressed by the win.

“I wouldn't rate it too highly to be honest, as he wasn't a top level opponent, that guy.”

After that, Joshua was shown a clip of Dillian Whyte, who he himself beat back in December 2015, knocking out Lucas Browne.

The Londoner compared the win to one of Samuel Peters, the Nigerian heavyweight, saying, “History repeats itself.

“What we're doing today, if you look back, the old fighters were doing this years ago.

“Dillian did well though... I said it would be round six! And it also announced Dillian again, that he was a knockout artist.

“He needed that win as he was chasing the Wilder fight. He needs to be knocking opponents like Browne out.”

Joshua was then asked to talk the viewers through one of his own knockouts, against Alexander Povetkin in his last fight.

AJ ended the bout in the seventh-round against a rival who has never before been beaten inside the distance.

“I was mashed up going into it, it was a really hard camp,” said Joshua.

“But we got the win, and that's all that matters.

“He was very good at avoiding punches. But I adapted and figured him out. I hit him in the body, which I knew would take the energy out of him, and then when the time was right, I just went over the top.”

Finally, Joshua was shown Aleksandr Usyk's knockdown of Tony Bellew. It was Bellew's final fight, but it wasn't to be a happy ending for the Liverpudlian as he was knocked out in the eighth round against one of the best fighters on the planet.

“It was a good performance from Bellew and also from Usyk,” said Joshua.

“Usyk had Bellew at the right time of his career. Boxing's not only about how good you are but also about taking the right fights, and Usyk's management team got it right.

“It was a good fight from both of them.”

The Brit will next be in action in June this year, when he faces Jarrell Miller. It will be Joshua's first fight in the States, with the bout taking place at Madison Square Garden.