Flanagan beats Spain's Petrov with a unanimous points decision
Adams beats Carcamo on debut - winning 40-36 in 4 x 2 minute rounds
Liam Smith beats Liam Williams with 9th round stoppage
Williams' corner stop fight following bad cut to eye
Welshman was ahead on scorecards; Smith was also badly cut
Wins for Catterall & Dubois on undercard
Williams v Smith
Liam Williams starts again with the jab, looking for a chink in Smith's guard.
Smith is struggling to get in range and avoid William's pneumatic left hand.
As the round goes on the Liverpudlian connects with a right hand, the cross working for him so far.
Image source, PA
Image source, ReutersWillams v Smith
Liam Williams has started aggressively, throwing plenty of jabs.
Liam Smith is happy to taking a watching brief, sitting back behind his guard and taking the shots on his gloves.
Smith managed a body shot, but Williams finishes on the front foot.
Confident start by the Welshman.
Image source, ReutersBell rings and we're off.
Terry O'Connor is the man to keep these two apart tonight.
A few boos ring around as Wales' Liam Williams is announced.
Has Liverpool's Liam Smith managed to turn the Manchester Arena into his home crowd tonight?
Sounds like his has brought a lot of fans with him down the M62.
And here comes Liam 'Beefy' Smith.
He walks out to the Kungs vs Cookin' on 3 Burners classic.
Big smile on the Liverpudlian's face.
Image source, Getty ImagesHereeeeeee we go...............
The ring walk is begining.
First in, Liam 'The Machine' Williams, with a gold hood.
He comes out to the Fugees' Ready or Not.
Image source, PALiam WIlliams v Liam Smith
Fair to say Liam Smith is not happy that he is not favourite for this fight.
"A lot of people are going to look silly when this fight is over," he said. "I'm confident on my behalf that this is not a 50-50 fight."
Liam Williams v Liam Smith
Michael Pearlman
BBC Wales Sport at the ,Manchester Arena
When even the bookies cannot decide on a likely winner, you know that the notion of a fight being 50/50 is more than just promoter hyperbole.
And so it is for the battle of the Liams in Manchester, as Liverpool's Smith and Welsh boxer Williams face off for what was scheduled to be the WBO interim world light-middleweight title.
Smith is a former world champion and part of one of British boxing's most successful families and arguably has an edge when it comes to big fight experience, having lost the title to Saul 'Canelo' Alvarez in September.
Meanwhile, Williams is undefeated, highly-rated and highly-motivated. The stage is set. Or so we thought.
As ever in boxing, things can change and at Friday's weigh-in, they did.
Smith failed to make weight and did not return to the scales, meaning only Welsh fighter Williams can secure interim title status with a victory.
Liam Williams v Liam Smith
Image source, Getty ImagesThis fight became an interim world title opportunity because WBO light-middleweight champion Saul 'Canelo' Alvarez will fight fellow Mexican Julio Cesar Chavez Jr on 6 May.
That bout will take place at a catchweight between middle and super-middleweight - 164.5lbs - and so will not be for a world belt.
By going up in weight, Alvarez, who beat Liam Smith last September, will vacate the title, so Liam Williams could therefore become world champion.
If Alvarez does not vacate it then Williams would have to fight the Mexican.
Plenty at stake for Williams.
Liam Smith v Liam Williams
Michael Pearlman
BBC Wales Sport at Manchester Arena
Liam Smith v Liam Williams is a contest that has had British fight fans captivated for months, but it was within a whisker of being cancelled after weigh-in drama on Friday.
Liverpool’s Smith missed the weight for his proposed WBO interim light-middleweight world title fight, and opted not to return to the scales, later blaming confusion over how long he had to shift the rogue two lbs.
That led to confusion, with several hours passing before the WBO confirmed the contest could go ahead, with the interim world title status still in play for Welshman Williams.
However, for Smith, the glory of victory will have to suffice, as he suffers the consequences of failing to make championship weight.
Both fighters have hundreds, if not thousands of fans in attendance at the Manchester Arena, for a contest that is arguably tonight’s true main event, if you are a boxing nut.
Smith arguably has the greater track record, Williams the unblemished record, which all equals a tantalising prospect for fight fans.
Image source, PALiam Williams v Liam Smith
Image source, ReutersLiverpool's Liam Smith failed to make the weight on Friday for his proposed WBO interim light-middleweight world title fight with Liam Williams.
The pair will still meet in Manchester tonight, but only Wales' Williams can now claim interim champion status with a victory.
England's Smith initially weighed in at 11st 1lb 15oz, almost 2lbs over the limit and elected not to be re-weighed.
He later apologised on Twitter adding: "This is the first time I have missed weight in eight years. The fight still goes ahead and believe me, my punishment in not being able to win the belt, is hurting enough."
Liam Williams v Liam Smith
The should have been a battle for the WBO interim world light-middleweight title.
Two Liams, England v Wales, clashing in Manchester.
Things have changed.
A title is on the line, but only one fighter can win it.
Confused?
It all comes down to Liam Smith's weight.
Image source, PARight, let's get to the first big fight of the night, the battle of the Liams.
Image source, PATriple D. 'Dangerous' Daniel Dubois. Remember that name.
The 6ft 5in Londoner has been sparring the likes of Anthony Joshua and Tyson Fury.
Many are tipping him the 19-year-old to be the United Kingdom's next big name heavyweight. Of course, it's very early days.
Image source, PAMichael Pearlman
BBC Wales Sport at the Manchester Arena
Image source, rexHighly-rated prospect Daniel Dubios won his professional debut with a first round TKO of Marcus Kelly.
The fight was stopped after 35 seconds of the first session.
You will go a long way to find a bigger physical mismatch, with Kelly billed as being five foot 10 inches against the 6ft 5in Dubios.
But before we get to that fight, a short time ago in the ring, this happened...
Image source, Getty ImagesNicola Adams may be the name that's got us all excited tonight, but it's another phenomenal Brit that tops the bill at Manchester Arena.
Hometown fighter Terry Flanagan is looking to defend his title WBO world lightweight against Russia's Petr Petrov.
The 27-year-old is unbeaten in 32 fights, giving him the best unbeaten record compared to any other current world champion in Britain.
First up, though, is an all-British bout between Liam Smith and Liam Williams...
Adams v Carcamo
Image source, Getty ImagesShe's Great Britain's golden girl...
Nicola Adams has dominated on the global stage at not one, but two Olympics.
Gold in Rio followed gold in London four years earlier.
But now it's time to enter the paid ranks, where a whole new test awaits.
Image source, Getty ImagesThe 34-year-old makes her professional debut tonight at Manchester Arena, where she faces Argentina's Virginia Noemi Carcamo.
There's no title on the line for the flyweight, but Adams knows a convincing performance could set her on the path to further boxing greatness as a pro.