Commentary of every game available at top of this page
All 18 counties split into three regional groups of six
Each side will play five games
Two sides with most points play five-day final
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Bairstow c Patel b Chappell 5 (Yorkshire 23-2 v Notts)
Got him!
Zak Chappell's deserved that scalp as Jonny Bairstow plays it straight to Samit Patel at backward point.
Not the innings the England man would've wanted.
Yorkshire 23-1 v Notts
After 18 deliveries Jonny Bairstow finally gets off the mark with a well-timed boundary.
These are tough conditions at the crease for Bairstow and Tom Kohler-Cadmore. Notts' Jake Ball and Zak Chappell are getting it to swing.
Image source, Rex FeaturesSo, no batting side is off to a flier this morning. If anything, the bowlers have been on top.
Plenty of time for things to change though as the August furnace heats up this afternoon.
Image source, Rex FeaturesDurham 14-2 v Lancs
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Steel lbw b Wood 1 (Durham 14-2 v Lancs)
A maiden Lancs wicket for Luke Wood!
Cameron Steel tries to pad up at one that nips back and gets it all wrong.
It smashed into the pad and looked pretty plumb to me.
Leics 15-2 v Derbys
And here's that Derbyshire wicket...
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Madness.
Essex 21-1 v Surrey
Essex have just lost their first wicket, Nick Browne nicking Gus Atkinson to slip for eight.
England's record Test run scorer, Alastair Cook, is still there on nine.
Also in the South group Darren Stevens has picked up a wicket for Kent against Sussex - Phil Salt the man to go. Sussex are doing okay though - 39-1.
Have a look at this socially distanced celebration from Kent. Strange times we're living in folks...
Image source, Rex FeaturesHassan Azad st Hosein b Reece 6 (Leicestershire 15-2 Derbs)
What?!?!?
Stumped from 20 yards!
Derbyshire keeper Harvey Hosein spots Hassan Azad batting out of his crease and throws down the stumps after the batsman leaves a Luis Reece delivery.
Incredible keeping.
Gloucestershire 10-1 v Warks
The Bears have started well at Bristol.
There's no Olly Stone in the squad (side injury) but paceman Oliver Hannon-Dalby has stepped up and already taken the wicket of Gloucestershire captain Chris Dent.
Gubbins c Organ b Fuller 8 (Middlesex 15-2 v Hants)
No biggie for Nick Gubbins this week.
The Middlesex number three is out for eight as he pulls James Fuller to Felix Organ and deep fine leg. Organ takes a fine diving catch.
Durham 7-1 v Lancs
Great catch from Lancashire keeper Alex Davies.
Tom Bailey finds Sean Dickson's edge and the keeper takes a one-handed stunner.
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Abell c Rossington b Glover 0 (Northants v Somerset 7-3)
7-3! The captain goes.
Tom Abell is strangled down the leg side by Brandon Glover and Somerset are in all sorts of bother.
Northants v Somerset 7-2
Somerset are off to a shocker at Northants.
Openers Eddie Byrom and Tom Lammonby have both fallen in consecutive overs to leave them 7-2.
Image source, Getty ImagesYorkshire 6-1 v Notts
Jonny Bairstow sees off the remaining deliveries of Jake Ball's over.
If Bairstow gets a century here, does that make him nailed on for a place in the England test squad?
Middlesex 10-1 v Hants
Hampshire left-armer Keith Barker dismisses Middlesex opener Sam Robson and that brings the star of round one, Nick Gubbins, to the crease.
The 26-year-old made scores of 192 and 60 in Middlesex's victory over Surrey.
Lyth lbw b Ball 4 (Notts v Yorkshire 6-1)
Notts paceman Jake Ball traps Yorkshire opener Adam Lyth with a fiery in-swinger and in comes Jonny Bairstow at three.
Kent v Sussex 8-0
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A familiar scene up and down the country. About time too!
Phil Salt and Tom Haines are opening up for Sussex. Harry Podmore and Darren Stevens have the ball in hand for Kent.
Essex 2-0 v Surrey
At Chelmsford Sir Alastair Cook is in the middle for Essex.
It's a glorious day for batting and no doubt 'Chef' will be hungry to pile up the runs.
We'll keep a close eye on how the former England captain gets on.
Mitchell c Cooke b Hogan 0 (Worcs 0-1 v Glamorgan)
First wicket of the day klaxon!
It comes at New Road as Worcestershire opener Daryl Mitchell is snagged down the leg side by Michael Hogan.
Four balls it took.
Notts v Yorkshire 0-0
Speaking of Jonny Bairstow, Yorkshire head coach Andrew Gale said he was likely to bat up the order. We might not have to wait too long either as Yorkshire are batting first at Trent Bridge.
"Jonny still wants to keep for England, so while he wants to do that he's the best keeper in the country in my eyes," he said.
"We'll have a chat with him about where he wants to bat. I believe he wants to bat up the order.
"He's excited to come back into the side. He's dropped me a few texts this week, he rang me the other day, and he's got the bit between his teeth. While Jonny's in that mood, he's a dangerous player."
Read the full piece here.
Image source, Rex Features