Murray in trouble. A right hook from Groves shakes him to the bones and Murray's legs look unsteady. Groves well on top with two minutes left in the eighth.

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Murray goes for a huge right hook, but, unfortunately for him, can only connect with the top rope and not the top of Groves' head. It is a bit wild, but a left-right combination to the head is more accurate and more impressive.

Just with seconds remaining, and in a tough round to call, Groves launches an onslaught, beginning with a beautiful left uppercut, with the St Helens man hanging on and holding his opponent for the last few seconds.

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Early in the sixth and Murray is spun round and has to retreat as Groves moves in, looking for the finish.

An uppercut from Groves, with Murray on the ropes, finds the target, namely Murray's chin.

But a blast of energy from Murray sees a fast combination of punches to Groves' body. It was a slow start from the man from St Helens, and that is probably seeing him behind on the judges' scorecards, but he is at least giving his opponent something to think about.

Image source, PA

But Groves is proving tricky to catch, causing Murray to dive in again, off balance, in the final seconds. He would have done some damage if he connected, but he didn't. 

"He has mentally switched off," says Groves' trainer Shane McGuigan.

Image source, Reuters

Murray dives in early in the fifth and buries a left into Groves' ribs. Signs that Murray is prepared to go to the trenches and turn this one into a toe-to-toe battle.

Better from Murray. Much better. Groves, for the first time in the contest, is forced back into the corner and the man from St Helens unloads a barrage of punches to Groves's stomach.

Groves has also picked up a cut, to the side of his right eye. No clash of heads was too noticeable so that may well have been caused by fist.

Murray's best round of this contest by a massive distance.

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Two time super-middleweight world challenger Paul Smith gives his verdict on Groves v Murray.

I have to say I wasn't expecting this from Martin Murray. Three rounds in and he has not made a dent yet. He is struggling to get close.

But one thing we have learned throughout Martin Murray's career is that he has a great chin and can take some punishment. He will need to do something special soon as I have him losing all three of the opening rounds.

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Ben Dirs
BBC Sport at O2 Arena

"Murray is tough as old boots, Groves iffy around the whiskers but hits like a mule. Then again, they might not go at it..." 

The celebrities are out in force at the O2 Arena.

Also here tonight is boxer Amir Khan, fresh from his loss to Canelo Alvarez in Las Vegas last month, and Manchester City captain Vincent Kompany, who would be out in France representing Belgium in the Euros were it not for an injury. 

Image source, PA

Image source, PA

A swinging right hand from Murray, but the second round is similar to the opener. Groves doing enough to keep Murray at range with the jab.

Murray opting to defend at the moment. Not much is getting through from Groves, but he is the one doing enough to collect the points.

A cautious start for Murray, or a case of biding his time and waiting to attack?

Image source, Reuters

George Groves and Martin Murray are fighting to save their careers. Who do you think will win? Will this be the last fight for the loser? 

And, how do you think our main event will end? Who will fall and in what round? 

Does Dominic Breazeale have a chance? 

Have your say at #bbcboxing on Twitter like Elliot

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Cagey, very cagey. Both men looking what they are - men who know they cannot afford any slip-ups. A jab from Murray finds the target, but Groves does more of the attacking, trying to work the body to create an opportunity for the left hook.

You would say Groves has probably done enough to get the round, but not much for the fans or judges to be excited by.

Image source, Reuters

And here we go. Groves holds the centre of the ring, Murray already pushed back on to the ropes, with a high guard.

Image source, Lawrence Lustig

Between them, George Groves and Martin Murray have had seven world title fights with each of their efforts ending in disappointment. 

And Groves thinks whoever loses this fight will hang up their gloves for good. 

"I think the loser packs in," he said. 

"I am treating this like the last-chance saloon. If I can't beat Martin then I don't deserve to become a world champion."  

Murray said: "He thinks that this is an easy fight. But it's not, when it gets tough he will crumble."

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Four-time world title challenger Martin Murray has dismissed claims that George Groves is the bigger name in their clash at the O2. 

Murray fought abroad in all of his world title fights, whereas Groves lost twice to Carl Froch in a bitter rivalry. 

Murray said: “The fact that his name comes first means nothing to me – I’m a 33-year-old grown man, how’s that going to bother me? I’ve been in bigger fights than him all over the world against better opposition,

“He got his name by losing twice to Carl Froch and that’s how he’s the A-side."

Martin Murray has made his way to the ring, and now it is George Groves's moment.

He has fought in front of 80,000 at Wembley Stadium, when he suffered his second defeat against Carl Froch in 2014.

Groves seems to have the majority of the support from the London crowd. Both men look pumped up. They are both fighting to save their careers. 

Groves' last attempt at the top table saw him come away with a controversial, split decision defeat against Badou Jack in Las Vegas in September.

Strap yourselves in. This could be explosive.

George Groves himself has had three failed shots at winning that world title. He has Shane McGuigan, son to boxing legend Barry, giving him the orders tonight. 

Another impressive win tonight and that fourth world title shot could be his.

Image source, Lawrence Lustig

Some final words of encouragement from Matchroom Sport chairman Barry Hearn.

Image source, Lawrence Lustig