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
Flanagan v Petrov
Right then, Petr Petrov tries to get up close to Terry Flanagan but the British fighter is able to maintain a good distance.
He's got the longer reach and, most likely, the rounds in the bag so far.
You feel like this one is still waiting to come to life...
Image source, PAFlanagan v Petrov
I think Terry Flanagan senses he has to pick up the pace. A long right-handed reacher from Petr Petrov can't quite connect and Flanagan looks to counter.
He fires in a rapid right-hand jab and then sends Petrov tumbling, but the diminutive challenger regains his feet.
A strong finish from the defending champion.
Image source, PAFlanagan v Petrov
This Manchester Arena crowd is yet to really find its voice.
Terry Flanagan comes out with a little bit more urgency than in the first few rounds, but it's a good exchange from Petr Petrov that catches the eye.
Image source, PAFlanagan v Petrov
Right, can Terry Flanagan up this a little? He's taken the first two rounds but the crowd want more.
He lets Petr Petrov come onto him, but is just waiting for a loose one from the challenger. Not too much in that one, but I'm sure Flanagan will be the happier.
Image source, PAFlanagan v Petrov
Petr Petrov just doesn't stop moving. It's like he's got an itch, bouncing around, hustling and hands twitching.
He's a ball of pent up energy, while Terry Flanagan looks more relaxed.
He dips away from a Petrov charge but the pair then end up grappling and the challenger gets a warning for a cheap shot.
Image source, PAFlanagan v Petrov
Petr Petrov flicks a left glove towards Terry Flanagan but the Manchester man is equal to that and brings a roar from the home crowd as he catches the challenger.
But Petrov isn't fazed, he charges in again and a right hand rocks the home fighter. Better from the Spanish-based boxer towards the end of that round.
Flanagan v Petrov
There's the bell for round two, and it's Terry Flanagan who makes the first move this time.
Flanagan has the height advantage over Petr Petrov, the contender's baggy red shorts dropping below his knees to make him look even more squat.
Petrov launches in with a left, but Flanagan saw that one coming a long way off.
Image source, ReutersFlanagan v Petrov
Terry Flanagan scores with a right and then throws a lovely little left-right combo, catching Petr Petrov low.
The challenger decides it's time to stride forward but Flanagan counters smartly. He's quick on the jab as Petrov looks to struggle to find his footing slightly.
Flanagan v Petrov
Petr Petrov is twitching, looking for a gap in Terry Flanagan's defence, but the Manchester man seems composed and comfortable enough to take his time.
They're trying to size each other up at the minute. Not wishing to commit.
Image source, ReutersFlanagan v Petrov
Ding, ding, ding...
And we're off.
Flanagan v Petrov
Petr Petrov is fighting out of the red corner, Terry Flanagan is in the blue corner... of course.
The reigning, defending unbeaten WBO lightweight champion of the world wouldn't have it any other way.
Image source, ReutersFlanagan v Petrov
"From Manchesteeeeer, England..."
That's got the crowd going. Although I reckon they'll be split by his choice of song, it's Manchester City anthem Blue Moon.
He's looking like a lean, mean.... title-defending machine?
Let's find out...
Image source, ReutersFlanagan v Petrov
Here comes the challenger. It's Petr 'the Machine' Petrov.
The experienced Russian-born Spanish fighter bounds towards the ring, white cap, black t-shirt, red shorts.
He's here to spoil the party.
Flanagan v Petrov
Nate Williams
BBC Sport
What does Hughie Fury make of tonight's showpiece event?
"Terry Flanagan is very talented – he’s 32-0 for that reason," he said. "He’s not very well known at the minute but people will start to notice him soon if he keeps winning."
Flanagan v Petrov
Image source, Getty ImagesThere's hardly anything in this one.
Terry Flanagan is minimally lighter at 9st 8lbs 9oz to Petr Petrov's 9st 8lbs 10oz.
Flanagan v Petrov
Right then.
Next up, it's Manchester's own Terry Flanagan. That's who the crowd at Manchester Arena have paid the big bucks to see.
The 27-year-old Manchester City fan is looking to defend his WBO world lightweight title for a fifth time.
He faces Petr Petrov.
Image source, PASmith beats Williams
Michael Pearlman
BBC Wales Sport at Manchester Arena
Liam Williams has suffered a severe double laceration to his right eyelid and is on route to see a plastic surgeon.
Right, before we get to the main event tonight there's a little bit of news from the earlier fight between Liam Smith and Liam Williams to bring you...
Smith won that one by TKO after Williams' trainer Gary Lockett pulled him out due to a cut on the Welshman's eye.
Adams beats Carcamo
Here's Nicola Adams' promoter Frank Warren:
"We're going again on the 13 May in Leeds, a homecoming. That will be her first fight there since she was 13 - it will be a special night and part of the process.
"After a couple of fights we will look at whether we should be going for a title."
Adams beats Carcamo
More from Nicola Adams after her debut victory: "I'm learning everything from (trainer) Virgil Hunter.
"He knows how to take an Olympic champion and take them to a world champion, he has so much experience."
Image source, PA