Bit of carnage out there. I think it went something like this: Grace Gibbs bowls a no ball which gifts a free hit to Redmayne.
She then bowls a wide, so has to bowl it again.
Redmayne and Matthews scamper a two which results in a run out appeal but umpire Sue Redfern gives a dismissive shake of the head.
Gibbs then bowls another wide that goes past the 'keeper for four.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
The Welsh Fire have started a little cautiously but it has the look of a good wicket. They might start picking up the ante.
Fire 40-1
Hayley Matthews has been a little unlucky so far - she's hit some powerful shots that have picked out the boundary fielders.
And with the gun fielder Mady Villiers out on the boundary, she won't gift you many.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
Good sweep shot from Redmayne. That was the first time Gregory has over-pitched in this set.
Fire 35-1
I need to know who does Danielle Gregory's plaits. They are immaculate.
Fire 34-1
Danielle Gregory goes for a big lbw appeal on Georgia Redmayne but it's given not out.
And Redmayne responds with a thumping four. Lovely!
Fire 28-1
A flurry of singles keep the score ticking along for Fire. This pair of Matthews and Redmayne batted together for over 100 runs in the win against Manchester Originals, so it's a partnership the Invincibles will be desperate to break.
Not out
An easy one for the third umpire as it proves Redmayne has indeed hit it, and therefore can't be given out lbw.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
If there is no bat involved it could be quite close.
Umpire review
Georgia Redmayne misses one from Dane van Niekerk, it hits her almost in the stomach as she's low down trying to sweep.
van Niekerk consults with the wicketkeeper and they've gone for the review.
Post update
Who knew Bryony Smith could juggle?
Getty ImagesCopyright: Getty Images
Fire 25-1
End of the powerplay and Welsh Fire are going along at exactly one a ball.
BBC SportCopyright: BBC Sport
Fire 23-1
Shot! Hayley Matthews blasts the ball straight back at her batting partner, Georgia Redmayne, and nearly takes her head off.
Some good reactions from Redmayne means she ball just evades her and goes for four. Lovely.
Fire 19-1
Alice Capsey tidies things up with just two coming from her next set of five. The teenager has become one of the Invincibles' most important players already, she's that good.
Fire 17-1
Wow. Hayley Matthews joins the party with a stunning punch for four off the back foot.
A mixed bag for Mady Villiers there with a wicket and three boundaries. You win some, you lose some.
Fire 13-1
Welcome to the game, Georgia Redmayne!
Two fours from her first two balls and that'll ease the pressure nicely after that early wicket.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
There was a big deviation. It is a very good bit of glove work.
WICKET
Smith c Bryce b Villiers 3 (Fire 5-1)
First one gone!
The pressure was building on Bryony Smith and she looked like she was getting frustrated. She gets an edge through to wicketkeeper Sarah Bryce from Mady Villiers' first ball.
Fire 5-0
This is a good start from the Invincibles. Smith and Matthews just ticking off some singles as Tash Farrant completes a tidy set of five.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
A very measured start. Bowling the first over aged 16 is an exciting thing.
Live Reporting
Matthew Henry and Ffion Wynne
All times stated are UK
Fire 50-1
Bit of carnage out there. I think it went something like this: Grace Gibbs bowls a no ball which gifts a free hit to Redmayne.
She then bowls a wide, so has to bowl it again.
Redmayne and Matthews scamper a two which results in a run out appeal but umpire Sue Redfern gives a dismissive shake of the head.
Gibbs then bowls another wide that goes past the 'keeper for four.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
The Welsh Fire have started a little cautiously but it has the look of a good wicket. They might start picking up the ante.
Fire 40-1
Hayley Matthews has been a little unlucky so far - she's hit some powerful shots that have picked out the boundary fielders.
And with the gun fielder Mady Villiers out on the boundary, she won't gift you many.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
Good sweep shot from Redmayne. That was the first time Gregory has over-pitched in this set.
Fire 35-1
I need to know who does Danielle Gregory's plaits. They are immaculate.
Fire 34-1
Danielle Gregory goes for a big lbw appeal on Georgia Redmayne but it's given not out.
And Redmayne responds with a thumping four. Lovely!
Fire 28-1
A flurry of singles keep the score ticking along for Fire. This pair of Matthews and Redmayne batted together for over 100 runs in the win against Manchester Originals, so it's a partnership the Invincibles will be desperate to break.
Not out
An easy one for the third umpire as it proves Redmayne has indeed hit it, and therefore can't be given out lbw.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
If there is no bat involved it could be quite close.
Umpire review
Georgia Redmayne misses one from Dane van Niekerk, it hits her almost in the stomach as she's low down trying to sweep.
van Niekerk consults with the wicketkeeper and they've gone for the review.
Post update
Who knew Bryony Smith could juggle?
Fire 25-1
End of the powerplay and Welsh Fire are going along at exactly one a ball.
Fire 23-1
Shot! Hayley Matthews blasts the ball straight back at her batting partner, Georgia Redmayne, and nearly takes her head off.
Some good reactions from Redmayne means she ball just evades her and goes for four. Lovely.
Fire 19-1
Alice Capsey tidies things up with just two coming from her next set of five. The teenager has become one of the Invincibles' most important players already, she's that good.
Fire 17-1
Wow. Hayley Matthews joins the party with a stunning punch for four off the back foot.
A mixed bag for Mady Villiers there with a wicket and three boundaries. You win some, you lose some.
Fire 13-1
Welcome to the game, Georgia Redmayne!
Two fours from her first two balls and that'll ease the pressure nicely after that early wicket.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
There was a big deviation. It is a very good bit of glove work.
WICKET
Smith c Bryce b Villiers 3 (Fire 5-1)
First one gone!
The pressure was building on Bryony Smith and she looked like she was getting frustrated. She gets an edge through to wicketkeeper Sarah Bryce from Mady Villiers' first ball.
Fire 5-0
This is a good start from the Invincibles. Smith and Matthews just ticking off some singles as Tash Farrant completes a tidy set of five.
Post update
Chris Green
Middlesex all-rounder on BBC Radio 5 Live Sports Extra
A very measured start. Bowling the first over aged 16 is an exciting thing.