Darren Fletcher said on TNT Sports: "There's a lot of discussion around our commentary position, people asking us how low the shot was. There will be people who believe Daniel Dubois was robbed and people who think it was the right call."

Some techno is booming out at the arena.

Usyk looked to be a little fatigued after six rounds but he's found his second wind as he bounces around the ring and dances with his team.

Dubois was still feeling it from that knockdown at the end of the eighth round and Usyk sensed blood.

Usyk retains the WBA 'Super', WBO and IBF heavyweight titles.

After a brief celebration from the Ukrainian he crosses the ring to speak with Dubois.

Initially it looks a bit heated but Usyk seems to be praising Dubois for his performance.

Dubois is down again! He can't beat the count of 10 and it's waved off.

Usyk wins.

Image source, Getty Images

Darren Fletcher said on TNT Sports: "Don Charles is going to earn his money tonight to try and get the confidence back in Daniel Dubois after that knock down."

Dubois lands a firm right to halt Usyk as he steps forward.

But Usyk comes back fighting and puts Dubois down on one knee after landing a succession of shots to the head.

Dubois is back to his feet after nine seconds and then the bell goes.

How will he look coming out in the ninth?

Image source, Getty Images

Richie Woodhall said on TNT Sports: "Round by round he's getting more confident is Daniel Dubois."

Steve Bunce said on TNT Sports: "We saw there from Usyk stuff we haven't seen. Him missing, lunging, changing. He wants to get Dubois out of there. He was dropped by a shot on the boarder. He went down like he shot by a sniper. That's the most desperate I've ever seen Usyk."

Dubois does some great work to the body and Usyk backs away.

It looked like the champion even winced a bit as he uses the ropes for leverage.

Usyk isn't moving as freely as he usually does.

Referee Luis Pabon has to step in again to warn Dubois about pushing this time.

Darren Fletcher said on TNT Sports: "There was a really nice punch that Dubois landed right at the end of the last round. I wonder if he can build on that."

Richie Woodhall said on TNT Sports: "There was an initial response from Usyk, but right now, it's a lot better from Dubois."

The midway point of this title unified title fight and Dubois is starting to have a say.

Usyk seems to have lost his cool a little after feeling he was caught by a low blow in round five. On further inspection it looks like it was borderline.

Carl Frampton said on TNT Sports: "When I saw it, it didn't look low to me. That was not a low blow. That was a body shot. He should have been counted out. Daniel Dubois should be unified heavyweight champion right now."

Richie Woodhall said on TNT Sports: "Dubois has to get on that front foot now. Usyk is ruffled and still not recovered. Yes, it's a chance for Dubois now."

Steve Bunce said on TNT Sports: "The first one, two and three. Those rounds were what I expected. Suddenly in that round, Dubois got a little bit closer and let his hands. He didn't hurt him and he didn't win the round, but he kept on grazing Usyk. It was competitive. The first three weren't."

Dubois comes out with intent initially but then backs off and lets Usyk recover.

Is that an opportunity missed?

It was so well-mannered between the pair in fight week but there's some needle now.

Usyk puts his foot on the gas in the last minute and lands a couple of good shots.

There's even a bit of afters when the bell goes to signal the end of a highly dramatic round.

We've got a fight on our hands!

Darren Fletcher said on TNT Sports: "Listen to the crowd in here now, I wonder if he's just poked the tiger Dubois."

We're back under way but referee Luis Pabon has a word with Usyk's corner for their protests.

There's no point deduction for Dubois but he's told to "flight clean".

The referee tries to get the two fighters to touch gloves but Usyk isn't interested.

Usyk goes down just 30 seconds into the round but referee Luis Pabon immediately calls time out.

It looked low and Usyk is reluctant to get back to his feet.

That's not the first time Usyk has complained about a low shot in this bout.

That does not count as a knockdown.

Image source, Getty Images

Richie Woodhall said on TNT Sports: "Couple of good signs here from Dubois, he just gets closer and closer."