Commentary of every game available at top of this page
Northants-Glos called off because Northants player tests positive for Covid-19
Rory Burns captains Surrey, Jack Leach (Somerset) & Zak Crawley (Kent) also in action
Lancashire opener Keaton Jennings out for golden duck
All 18 counties split into three regional groups of six
Each side playing final group game; two teams with most points contest five-day final
Central Group top two, Worcestershire and Somerset, meet at New Road
North Group leaders Derbys at Lancs, second-placed Yorks host Leics
Essex, Kent, Middlesex and Hants in contention in South Group
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Glam v Warwickshire 127-5
Its been raining pretty heavily at Cardiff ever since the players went off around an hour ago.
The umpires decide to take an early tea at 14:50.
Ian Bell remains not out on 50 while Alex Thompson is on five.
Kent v Hampshire 144-7
Matt Milnes replaces Darren Stevens after his mammoth post-lunch spell and keeps the wickets coming for Kent against Hampshire.
Tom Scriven nicks through to give Ollie Robinson another catch with the gloves as Hampshire's batting slump continues.
Yorkshire v Leicestershire 124
Image source, Rex FeaturesAnd wickets keep coming for Yorkshire at Headingley as Ben Coad takes the last two of Leicestershire's first innings in quick succession.
Harry Swindells falls first after he tried to hold the tide at bay with a gritty 36 from 93 balls.
Coad then had tail-ender Alex Evans caught by Alex Lyth at second slip the very next ball to finish with figures of 5-18.
The perfect scenario Yorkshire were dreaming of when they won the toss.
Lavelle lbw b Melton 13 (Lancs 108-5 v Derbys)
George Lavelle's dogged defence is broken as he falls for 13 off 48 deliveries, trapped lbw by Dustin Melton.
George Balderson is the new man in, joining set batsman Josh Bohannon who's on 57 not out.
C Overton c Mitchell b Barnard 1 (Worc v Somerset 134-6)
And another one!
Craig Overton edges Ed Barnard to Daryl Mitchell in the slips.
Advantage Worcestershire in this crucial battle in the central group.
Davies b D'Oliveira 9 (Worc v Somerset 131-5)
Gone! Steve Davies is bowled by the leg-spin of Brett D'Oliveira for nine.
Somerset in trouble, they need a partnership and they need it now.
Craig Overton joins Edward Byrom (3) at the crease.
Essex v Middlesex 138
Simon Harmer collects his third wicket of the innings as Middlesex are bowled out by Essex for just 138.
Blake Cullen the last man out caught behind to give the South African figures of 3-34.
Pretty good result for the South Group leaders after they lost the toss this morning and found themselves in the field.
Sam Cook also took 4-27 and Jamie Porter 3-55.
Over to their batsmen now, Sir Alastair Cook included, to see if they can ramp home the early advantage and boost their chances of reaching the final.
Yorkshire v Leicestershire 120-8
Yorkshire's fine bowling effort continues at Headingley as Duanne Olivier takes his second of the Leicestershire innings.
Dieter Klein falls for just five to give Harry Brook another catch.
Lancashire 95-4 v Derbys
Derbyshire are still looking to wrap Lancashire's innings up as soon as possible but they're struggling to get through Josh Bohannon.
The Lancs number three brings up his half century off 125 balls with five fours.
Nicely played.
Yorkshire v Leicestershire 114-7
Three wickets for Yorkshire seamer Matt Fisher now to go with Ben Coad's three.
He has Ben Mike caught by Harry Brook for 17 as Leicesershire's struggles continue on 114-7.
Glam v Warwickshire 127-5
Its suddenly got rather dark at Sophia Gardens. There seems to be some rain around as well.
The players head off with the score on 127-5. Ian Bell has 50, while new man in Alex Thomson has five.
Walallawita lbw b S Cook 4 (Essex v Middlesex 120-9)
And a fourth wicket for Sam Cook now as Essex pick up Middlesex's ninth of the innings.
Thilan Walallawita is adjudged leg before to one that nips back into him playing no shot.
Essex bag the full compliment of bowling bonus points as well.
Kent v Hampshire 127-6
Image source, Rex FeaturesAnd three becomes four wickets now for Darren Stevens!
Lewis McManus is his next victim as the Hampshire wicketkeeper nicks off to his opposite number Ollie Robinson for 17.
Stevens now with 4-30 off 13.3 overs with all four coming in this spell the hour after lunch.
Abell c Cox b Pennington 59 (Worc v Somerset 120-4)
Huge breakthrough!
Good delivery from Dillon Pennington, an even better catch from keeper Ben Cox.
Somerset's danger man Tom Abell departs and the pendulum swing back in Worcestershire's favour.
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Glam v Warwickshire 119-5
He's done it! Ian Bell reaches his 161st first-class 50!
With wickets tumbling around him, Bell's experience has shone and his 102-ball half century is just about keeping Warwickshire in this game.
Only 50 more runs now to turn this into the dream final first-class game for the former England legend.
Image source, Getty ImagesBartlett b Tongue 18 (Worc v Somerset 120-3)
Got him! You wait forever for Bob Willis Trophy wickets and three come along at once.
George Bartlett chops on a Josh Tongue delivery and falls for 18.
Edward Byrom joins Tom Abell (59) at the crease.
Harris lbw b S Cook 34 (Essex v Middlesex 110-8)
Image source, Getty ImagesAnd talking of another wicket - Sam Cook also has his third of the day for Essex!
James Harris has his rearguard effort ended by a ball swinging back into him from the right-armer to end that decent eighth-wicket partnership of 34.
Northeast c Robinson b Stevens 16 (Kent v Hampshire 126-5)
And a third wicket for Darren Stevens in this prolific spell after lunch!
Former Kent man Sam Northeast the latest scalp for the 44-year-old as he nicks a ball that hoops away from him and finds the gloves of wicketkeeper Ollie Robinson.
Kent well and truly on top now.
Glam v Warwickshire 118-5
Ian Bell has been on 49 for a good five minutes now...
Conditions look very tricky in Cardiff. A couple of overs ago Michael Burgess slashed at one too many and Nick Selman took a sharp catch at slip off the bowling of Lukas Carey. That's three wickets in the match now for Carey.
Yorkshire v Leicestershire 69-6
Image source, Rex FeaturesBen Coad in the wickets again for Yorkshire with his third of the innings.
Arron Lilley the latest Leicestershire batsman to come and go leg before for just five.
Yorkshire pick up a second bowling point as they bid to keep on North Group leaders Derbyshire's coat tails.