Seven games: five in Division One, two in Division Two
Division One leaders Surrey at home to Essex
Second-placed Hampshire play Gloucestershire at Cheltenham
Notts, leaders of Div Two, away to Derbyshire in East Midlands derby
Warwickshire 77-3 v Kent 165
Another session full of incidents at Edgbaston with eight wickets falling.
But Sam Hain's 45 not out after the loss of three wickets has Warwickshire rapidly closing in on Kent's below-par 165.
Surrey v Essex 204-7
Finally Surrey break this seventh-wicket stand...
Dan Worrall gets his fourth wicket as he pins Simon Harmer lbw.
Harmer goes for an excellent 50.
Northants 209-7 v Lancashire
Tom Taylor, that is a bad way to get out!
Off just his fourth ball, he tries to reverse sweep Washington Sundar but misses and is given out LBW.
A fourth wicket for Sundar on his first day in county cricket.
Surrey v Essex 203-6
Essex number eight Simon Harmer gets to fifty with a lovely straight drive off Tom Lawes.
It also brings up Essex's 200 for a first batting bonus point.
You might argue the visitors are beginning to get on top at The Oval, even though the scorecard says 203-6.
Northants 209-6 v Lancashire
Lewis McManus steers one into the onside and that's his fifty.
It's a fourth of the Championship season for him, coming off 69 balls with seven fours and a six off Luke Wells.
Gloucestershire v Hampshire 203-2
The 200 is up for Hampshire and their first batting point.
Felix Organ does it with a lovely drive off Ryan Higgins and he is now into the nineties. But he has just two overs to grab his century tonight.
Northants 201-6 v Lancashire
Rob Keogh's stay at the crease is over.
But it's down to a piece of brilliance from Luke Wells. Keogh goes to drive Washington Sundar but edges where Wells takes an outstanding one-handed catch at slip.
You will not see too many better slip catches off spin bowling than this.
Somerset 164-2 v Yorkshire
Somerset added 65 runs in that hour-long afternoon session following a rain delay.
Captain Tom Abell has led the way with an unbeaten 60 and George Bartlett has provided excellent support. He's on 36.
Their stand is worth 98.
Northants 197-5 v Lancashire
Rob Keogh nudges Washington Sundar down to third man for a couple to bring up his half century.
It has come off 78 balls with six fours. And coming in at 78-3, he is leading a Northants recovery.
Surrey v Essex 195-6
The evening session is under way at The Oval.
Can Surrey finally break this seventh-wicket stand between Simon Harmer and Adam Rossington, currently worth 104.
Image source, Rex FeaturesLeaders Notts are in complete control at Derbyshire.
Unbeaten centuries from Haseeb Hameed and Ben Duckett have taken them to 283-1 at tea.
At Lord's Sussex are also in a strong position with the bat. Tom Alsop (81 not out) and Cheteshwar Pujara (65 not out) have put on 112 for the third wicket with Sussex on 211-2.
Middlesex chose to bowl don't forget.
Somerset 158-2 v Yorkshire
Tom Abell goes from 48 to 60 in three shots.
The Somerset skipper takes advantage of some wayward bowling from Matt Revis to flick three boundaries off his hip.
Yorkshire have really struggled since the resumption 45 minutes ago.
Warwickshire 61-3 v Kent 165
Navdeep Saini continues to deliver a real mixed bag at Edgbaston. There is another no-ball and two more four-balls in his third over.
The India seamer has shipped 34 runs in three overs and that is not great when you only have 165 runs to play with.
Northants 174-5 v Lancashire
Rob Keogh and Lewis McManus have looked determined after tea.
Their sixth-wicket partnership is now worth 50, the best of the match so far, as Northants go about rebuilding.
They could do with these two batting through the remainder of this reduced day's play.
Somerset 140-2 v Yorkshire
Shot!
Tom Abell plays the perfect cover drive as he strokes Matt Revis to the rope to move to 40.
Somerset are just beginning to take control of this game at Taunton.
Gloucestershire v Hampshire 172-2
Gloucestershire have plugged away and Oliver Price has chiselled out his maiden first-class wicket.
Nick Gubbins tries to work the spinner square but gets a faint edge and wicketkeeper James Bracey does brilliantly to catch it between his legs.
Nice work from the 'keeper.
Surrey v Essex 194-6
What a session for Essex.
Simon Harmer and Adam Rossington bring up their 100 stand just before the break.
No wickets for Surrey who toiled a bit under the sweltering sun.
Warwickshire 50-3 v Kent 165
Sam Hain has taken the option to be positive and he has raced to 25 with five boundaries, most of which have been very pleasing on the eye.
Eventful start from Navdeep Saini, who has one wicket, four no-balls and 23 runs shipped from his two overs so far.
Warwickshire 32-3 v Kent 165
A first Kent wicket for India seamer Navdeep Saini.
An eventful first over includes two no balls, but he gets it right as Chris Benjamin is caught, edging to Jack Leaning at third slip.
Kent right back in this contest.
Who knows how this game will look at the close of play?
Surrey v Essex 180-6
What a vital half-century this has been from Essex wicketkeeper Adam Rossington.
Along with Simon Harmer, he's helped rescue his side from 91-6 at The Oval.
He gets there off 86 balls with a single off Tom Lawes as Surrey remain wicketless in this session.
Image source, Rex Features