BBC Radio 5 Live Sports Extra

The two fighters are in the ring. You can listen to this one on BBC Radio 5 live sports extra right now, which is available via this page.

But before the main event there is one more fight on the undercard - British heavyweight Hughie Fury faces Alexander Povetkin.

Fury, 24, beat Samuel Peter by seventh-round TKO earlier this month to improve his professional record to 23-2.

Povetkin has not fought since September's defeat by Anthony Joshua. The former WBA champion lost via a seventh-round knockout to former WBA, IBF and WBO champion Joshua at Wembley Stadium.

Fury's last defeat was via a points decision in October to Bulgarian Kubrat Pulev in an IBF Final Eliminator in Sofia.

Image source, Getty Images

Michael Emons
BBC Sport at O2 Arena, London

London will bring back happy memories for both fighters as they both won Olympic gold in the capital back in 2012 - Luke Campbell winning at bantamweight and Vasyl Lomachenko taking the glory at lightweight.

We’re at the O2 Arena tonight, only a short five-mile car journey away from the Excel Exhibition Centre, which staged the boxing in the Olympics seven years ago.

Which man will be having another night of celebration tonight and who will be leaving with three golden world championship belts?

Image source, Michael Emons

Image source, Getty Images

Luke Campbell says he will defy the odds against pound-for-pound king Vasyl Lomachenko.

Ukraine's Lomachenko, 31, has won world titles at three different weights in a 14-fight professional career.

"I expect me winning this fight some way or form," said Campbell. "Somehow I will win by doing what I do best. I've always dreamed of a massive pinnacle fight. It selling out and everybody screaming my name... it's going to be amazing."

While Luke Campbell is expecting significant support at London's O2 Arena, Lomachenko was loudly cheered to the ring for his public workout at York Hall earlier in the week.

Check it out below.

Michael Emons
BBC Sport at O2 Arena, London

The fight programme is a good read, with some interviews with all the fighters and some great quotes from promoter Eddie Hearn.

“Bringing Lomachenko to the UK was a major move for us and for British boxing, it’s an honour,” said Hearn.

“You’re talking about the best fighter on the planet. When Muhammad Ali and Sugar Ray Leonard came over, they were major moments and so is this. You may never get a chance to watch Vasiliy Lomachenko box in Britain again. This will be a monumental event, not just in Britain but all around the world.

“Everybody thinks he is unbeatable and nobody is giving Luke a chance. I do and people in boxing do. They all say this will be the toughest test of Lomachenko’s career so far and I truly believe it will be.”

Image source, Michael Emons

Image source, Reuters

Edwards leaves the Arena with a big smile on his face and cheers ringing in his ears.

Penny for Martinez's thoughts, though. World champion for five minutes and then its gone.

Image source, Reuters

Image source, Reuters

Charlie Edwards, speaking to Sky Sports: "This is the right decision. I took a knee for a purpose. He finished me off with a body shot and I could not recover. Cheaters never prosper. We get in this ring to abide by the rules."

WBC president Mauricio Sulaiman wastes no time in declaring the fight a no contest so that means Charlie Edwards remains the WBC flyweight champion.

Correct decision and swift resolution. Fair play.

Right, well Martinez doesn't have long to celebrate victory because it won't count!

Scenes inside the O2 now!

Image source, Reuters

Eddie Hearn, speaking to Sky Sports: "The shot was not late it was next week. It is a blatant low blow."

Charlie Edwards, speaking to Sky Sports inside the ring: "I'm gutted to say the least but we live to learn. I just want to say a massive thanks to everyone here for their support.

"All credit to Martinez, he got the decision. We will have to go back and watch it. He did hurt me I won't deny that but it was a shot while I was on the knee that put me away."

All over!

Edwards is floored after a flurry of body shots in round three and Martinez is the new WBC world flyweight champion.

Controversy, though, as replays show Edwards was hit when he was down. Boos ring out around the O2 Arena.

Martinez keeps up the aggressive approach and lands an early hit on Edwards. He looks dangerous but Edwards responds with a solid right hand to unsettle his opponent a bit.

Aggressive start by Martinez as Edwards makes a cautious start to the fight, sizing up his opposition and making his move on the counter. Close and competitive stuff to begin with.

Heck of a reception for Charlie Edwards as he enters the ring.

His WBC world flyweight title bout with Julio Cesar Martinez is under way.

Michael Emons
BBC Sport at O2 Arena, London

Luke Campbell’s trainer Shane McGuigan had said a win for his fighter against three-weight world champion Vasyl Lomachenko tonight would be the biggest shock win from a British fighter since Lloyd Honeyghan’s away win over Donald Curry in Atlantic City for the welterweight world title back in 1986.

Lomachenko starts as a 1-14 favourite with Campbell a 10-1 outsider, although Anthony Joshua’s recent heavyweight world title defeat against Andy Ruiz showed that the odds-makers do not always get it right and anything can happen in boxing.

Image source, Michael Emons

Can you beat a professional boxer at our 12-second challenge? Former world champion Liam Smith got 63 - how many can you get?

Send us your efforts on #bbcboxing and you might just get some critical analysis from the legendary Steve Bunce!

Jamie Keeley: If Campbell beats Lomochenko it has to be one of the greatest wins in British boxing history.