Tammy Beaumont is desperate for a boundary but a superb diving stop from Deandra Dottin - her again! - near the ropes means it's only two.
So, 23 needed off 10 balls.
Fire 132-3
Target 157
Tammy Beaumont gives herself room to lash one but again just a single as it's straight to a fielder.
One off the next too. Good set from Potts.
BBC SportCopyright: BBC Sport
Fire 130-3
Target 157
Fran Wilson cuts Potts away for a single but ones are not enough for Welsh Fire.
Fire 129-3
Target 157
Tammy Beaumont ramps a single off Grace Potts. Didn't time it well but got away with it - 28 needed off 14.
Post update
Aatif Nawaz
BBC Radio
An easy catch and Sutherland has to go on the first ball. Another wicket falls in quick succession for the Welsh Fire. They really are crumbling here. Manchester Originals coming back very strong into this game.
BBCCopyright: BBC
Fire 127-3
Target 157
Fran Wilson smashes the hat-trick ball away for four.
What a game Deandra Dottin is having though, 67no with the bat, 2-20 with the ball.
WICKET
Sutherland c Satterthwaite b Dottin 0 (Fire 123-3)
Golden duck for Annabel Sutherland!
Deandra Dottin on a hat-trick!
Sutherland lofts a gift up to Amy Satterthwaite at backward square leg.
BBC SportCopyright: BBC Sport
WICKET
Haynes c Potts b Dottin 11 (Fire 123-2)
Now then.
Full toss from Deandra Dottin and Rachael Haynes tries to attack it but fires straight at Grace Potts who holds on at extra cover to make up for that earlier drop.
Post update
Abhishek Jhunjhunwala
Former IPL batter on BBC Radio
Welsh Fire are still in this game. If Potts had caught that, Beaumont would have been out. That's the thing about cricket, these small moments can change things.
Fire 121-1
Target 157
And, of course, as is always the case in cricket, the dropped catch is punished next ball as Rachael Haynes crashes a big drive away for four.
Dropped catch
Fire 116-0 - target 157
Oh no, Grace Potts drops a great chance to dismiss Tammy Beaumont at deep extra cover.
How big could that be?
BBC SportCopyright: BBC Sport
Fire 112-1
Target 157
So, 45 needed off 25 balls for Welsh Fire to pull off victory.
Make that 45 off 24 as Emma Lamb delivers a dot ball.
Post update
Abhishek Jhunjhunwala
Former IPL batter on BBC Radio
Matthews has got her team into a very strong position. But with a couple more wickets things could change.
Post update
BBC SportCopyright: BBC Sport
Post update
Alison Mitchell
BBC Radio commentator
Sophie Ecclestone gets the breakthrough and Matthews is gone! Ecclestone does it, the No. 1 in the world. Is this the time the game could turn?
It's a fine ovation for Matthews as she walks off.
WICKET
Matthews b Ecclestone 69 (Fire 110-1)
And there is that wicket!
Sophie Ecclestone is the bowler to strike with a lovely delivery that befuddles the West Indies batter and strikes leg stump.
A brilliant innings of 69 comes to an end and in comes Rachael Haynes for Welsh Fire.
Post update
Alison Mitchell
BBC Radio commentator
There's 30 balls left and 47 runs are needed. Can Welsh Fire get over the line and secure their first win in this tournament?
Fire 110-0
Target 157
Emma Lamb stemmed the bleeding for the Originals there with a decent set.
You suspect Manchester have to take a wicket if they are to win this though - they simply have to break this century opening partnership.
Fire 108-0
Target 157
Hayley Matthews gets some luck, chipping one up off Emma Lamb but short of a fielder.
An errant throw at the stumps gifts Welsh Fire an overthrow single too.
Post update
Thea Brookes
Central Sparks all-rounder on BBC radio
How are the Manchester Originals going to put the brakes on because this is the exact acceleration the Welsh Fire needed?
Live Reporting
Michael Beardmore and Josef Rindl
All times stated are UK
Fire 134-3
Target 157
Tammy Beaumont is desperate for a boundary but a superb diving stop from Deandra Dottin - her again! - near the ropes means it's only two.
So, 23 needed off 10 balls.
Fire 132-3
Target 157
Tammy Beaumont gives herself room to lash one but again just a single as it's straight to a fielder.
One off the next too. Good set from Potts.
Fire 130-3
Target 157
Fran Wilson cuts Potts away for a single but ones are not enough for Welsh Fire.
Fire 129-3
Target 157
Tammy Beaumont ramps a single off Grace Potts. Didn't time it well but got away with it - 28 needed off 14.
Post update
Aatif Nawaz
BBC Radio
An easy catch and Sutherland has to go on the first ball. Another wicket falls in quick succession for the Welsh Fire. They really are crumbling here. Manchester Originals coming back very strong into this game.
Fire 127-3
Target 157
Fran Wilson smashes the hat-trick ball away for four.
What a game Deandra Dottin is having though, 67no with the bat, 2-20 with the ball.
WICKET
Sutherland c Satterthwaite b Dottin 0 (Fire 123-3)
Golden duck for Annabel Sutherland!
Deandra Dottin on a hat-trick!
Sutherland lofts a gift up to Amy Satterthwaite at backward square leg.
WICKET
Haynes c Potts b Dottin 11 (Fire 123-2)
Now then.
Full toss from Deandra Dottin and Rachael Haynes tries to attack it but fires straight at Grace Potts who holds on at extra cover to make up for that earlier drop.
Post update
Abhishek Jhunjhunwala
Former IPL batter on BBC Radio
Welsh Fire are still in this game. If Potts had caught that, Beaumont would have been out. That's the thing about cricket, these small moments can change things.
Fire 121-1
Target 157
And, of course, as is always the case in cricket, the dropped catch is punished next ball as Rachael Haynes crashes a big drive away for four.
Dropped catch
Fire 116-0 - target 157
Oh no, Grace Potts drops a great chance to dismiss Tammy Beaumont at deep extra cover.
How big could that be?
Fire 112-1
Target 157
So, 45 needed off 25 balls for Welsh Fire to pull off victory.
Make that 45 off 24 as Emma Lamb delivers a dot ball.
Post update
Abhishek Jhunjhunwala
Former IPL batter on BBC Radio
Matthews has got her team into a very strong position. But with a couple more wickets things could change.
Post update
Post update
Alison Mitchell
BBC Radio commentator
Sophie Ecclestone gets the breakthrough and Matthews is gone! Ecclestone does it, the No. 1 in the world. Is this the time the game could turn?
It's a fine ovation for Matthews as she walks off.
WICKET
Matthews b Ecclestone 69 (Fire 110-1)
And there is that wicket!
Sophie Ecclestone is the bowler to strike with a lovely delivery that befuddles the West Indies batter and strikes leg stump.
A brilliant innings of 69 comes to an end and in comes Rachael Haynes for Welsh Fire.
Post update
Alison Mitchell
BBC Radio commentator
There's 30 balls left and 47 runs are needed. Can Welsh Fire get over the line and secure their first win in this tournament?
Fire 110-0
Target 157
Emma Lamb stemmed the bleeding for the Originals there with a decent set.
You suspect Manchester have to take a wicket if they are to win this though - they simply have to break this century opening partnership.
Fire 108-0
Target 157
Hayley Matthews gets some luck, chipping one up off Emma Lamb but short of a fielder.
An errant throw at the stumps gifts Welsh Fire an overthrow single too.
Post update
Thea Brookes
Central Sparks all-rounder on BBC radio
How are the Manchester Originals going to put the brakes on because this is the exact acceleration the Welsh Fire needed?