James Anderson passes 1,000 first-class wickets taking 7-19 for Lancashire against Kent
Ben Stokes takes three wickets for Durham against Warwickshire
Dom Bess takes 7-43 for Yorkshire against Northamptonshire
Colin de Grandhomme makes 174 not out on first-class debut for Hampshire against Surrey
Michael Atherton's son, Josh de Caires, makes Middlesex debut against Gloucestershire
Hampshire 453-9 v Surrey
Tremendous. Will Jacks floats one up wide of off stump and Colin de Grandhomme powers it over extra cover to reach 150 from 192 balls. It's the third six of his innings and this is now a first-class career-best score by the New Zealander.
Somerset 461-9d v Leics 1-0
A great start, a great end and a big collapse in the middle.
It all adds up to a commanding total for Somerset and plenty for their attack to bowl at.
Marchant de Lange's fun ended at 75 with Josh Davey unbeaten also 75.
Eight, Nine and 10 all making 70s.
You're never through Somerset.
Glos 122-2 v Middlesex
Gloucestershire trying to settle again after another early wicket went down in the session.
Miles Hammond, who did very well when coming into the side for Kraig Brathwaite last month, goes to a half-century.
Warwickshire 110-2 v Durham
Rob Yates reached 50 from 131 balls with a four through the covers off Ben Raine. He already has two Championship hundreds this season - will there be a third for him today?
Northants 170 v Yorks 158
Image source, Getty ImagesDom Bess has finished Northants off and claims 7-43 - a career-best.
It's kept Yorkshire right in the game because the deficit is only 12.
The hosts were well placed at 88-2 but apart from the openers, only one batsman made more than 11.
Lancashire v Kent 15-3
Kent have survived a James Anderson over without losing a wicket and it contained a single for Joe Denly. Anderson's figures are now 4-3-1-3.
Hampshire 430-9 v Surrey
Hampshire are still batting at the Ageas Bowl following a late lunch. Four from the last over, bowled by Rikki Clarke and Colin de Grandhomme is now 143 not out, with Brad Wheal on 23. They have so far added 56 for the last wicket.
Notts 25-2 v Derbyshire 149
Image source, Rex FeaturesA double breakthrough for Derbyshire at Trent Bridge as Ben Slater pulls a ball from Fynn Hudson-Prentice but is caught at mid-on for seven and Ben Compton follows first ball, caught at third slip.
FHP is on a hat-trick - but Steven Mullaney survives the next delivery.
Warwickshire 104-2 v Durham
Rob Yates nudges Brydon Carse behind square for an easy single and Warwickshire's total reaches 100. Another at the end of the over takes the left-hander to 46 not out.
Middlesex top-order batsman Steve Eskinazi signs a new contract with the Lord's outfit.
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Lancashire v Kent 5-3
There can't be many batsmen who would relish taking on James Anderson in these conditions. There goes another as Ollie Robinson edges to the keeper. Joe Denly is joined by Jack Leaning for Kent.
Notts 20-0 v Derbyshire 149
Haseeb Hameed is batting with some fluency at the start of the Notts innings. He punches Fynn Hudson-Prentice away square of the wicket for four - a shot which was very productive for Geoffrey Boycott during his illustrious career - and is 16 not out.
Northants 154-8 v Yorks 158
Dom Bess has single-handedly kept Yorkshire in the game at Wantage Road.
He's added another quickfire brace of wickets to his two this morning and now has a six-for.
If the hosts do squeeze into the lead it'll probably only be a marginal one now.
Somerset 445-8 v Leics
Marchant de Lange is causing some mayhem at Taunton.
He's got recent history in merry slugging - taking Northants for a maiden first-class hundred last season.
Six sixes so far at Taunton, the sixth time he's passed fifty in his first-class career, and he's whacking the Foxes out of the game.
Lancashire v Kent 1-2
It's that man again.
No, not the 1940s radio comedy show - James Anderson taking another Kent wicket.
The one that dismissed Zak Crawley was a good delivery, but this one - to Jordan Cox - is even better and Luke Wells takes it chest-high at first slip.
Notts 6-0 v Derbyshire 149
Overpitched by Michael Cohen and the left-armer's natural angle makes it easy for Haseeb Hameed to stroke the ball through the covers for the first boundary of the Notts innings.
Lancashire v Kent 0-1
Finally, there is action at Old Trafford and it's a wicket maiden by James Anderson who removes England team-mate Zak Crawley with the final delivery of his opening over.
It was a beauty which left him and Rob Jones took an excellent catch low to his right. What a start!
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Gloucestershire 87-2 v Middlesex
A big wicket for Middlesex. The ball from Blake Cullen is angled across James Bracey and the England wicketkeeper edges through to John Simpson as he tries to force it away off the back foot. A pretty loose stroke which he rehearses before walking off.
Warwickshire 95-2 v Durham
They are back out at Edgbaston. Ben Raine opens up for Durham and the over yields just a couple of singles. Rob Yates is 44 not out and Sam Hain has 14.
Nottinghamshire v Derbyshire 149
Warwickshire 93-2 v Durham
Gloucestershire 77-1 v Middlesex
Hampshire 417-9 v Surrey
Somerset 408-8 v Leicestershire
Lancashire v Kent - no play before lunch
Northamptonshire 140-6 v Yorkshire 158
Sussex 226 v Glamorgan 48-2