Ollie Pope makes 136 after D1 leaders Surrey put in by Yorkshire
Second-placed Hampshire all out for 57 against Kent at Ageas Bowl
Twenty six wickets fall on day one of Essex's game with Lancashire
Tom Abell scores fourth Championship ton of season for Somerset
Dom Sibley makes unbeaten 105 for Warwickshire at Bristol
D2 leaders Notts could clinch promotion with win at Worcester
Simon Harmer, Dane Paterson and Matthew Potts reach 50 wickets for the season
Glamorgan opener David Lloyd hits double century against Derbyshire
Surrey 4-0 v Yorkshire
Not entirely convincing.
Ryan Patel attempts a cover drive off Jordan Thompson and a thick edge flies past the slip cordon for four.
The Division One leaders are up and running at the Oval.
Essex v Lancashire 1-0
Image source, Rex FeaturesSam Cook twice beats Luke Wells' outside edge in his opening over.
England have been looking at Cook - you can see why.
Worcs v Notts 5-0
Jake Ball has three slips and a short leg as he bowls to Jake Libby.
Libby picks up three to deep extra cover.
A steady start for the Pears. The match referee here is Devon Malcolm.
I wonder how he would've fared on this slightly green-tinged pitch?
Surrey 0-0 v Yorks
Ben Coad's opening over was a maiden.
Jordan Thompson will share the new ball for Yorkshire.
He is their leading wicket-taker in the Championship with 42 so far.
Somerset 2-0 v Northants
Somerset have bucked today's trend by opting to bat first after winning the toss at Taunton.
Tom Lammonby gets the scoreboard moving with a couple off Ben Sanderson - but it's a tidy start by the Northants seamer.
Hampshire v Kent 0-1
It doesn't take Barker long to get into his work!
With the fifth ball of the morning, he nips one back to Tawanda Muyeye, who unwisely shoulders arms, and the umpire's finger goes up.
Great start for the hosts.
Gloucs v Warwks 4-0
Payne is bowling a full length to Rob Yates, who leans into a ball wide of off stump and drives pleasantly through the off side for four runs.
Ajeet Dale will bowl the second over with two slips and a gully in place.
Its a more than handy attack too, boasting the purple patch form of Dane Paterson, plus Jake Ball and Brett Hutton.
Hutton will bowl the first over.
Ed Pollock and Jake Libby wielding the willow for the Pears first up.
Hampshire v Kent 0-0
Hampshire have opted to bowl first as they chase a first title since 1973.
Tawanda Muyeye and Ben Compton stride to the middle for Kent.
Keith Barker has the new ball - he needs one wicket to reach 50 for the summer...
Surrey 0-0 v Yorkshire
Rory Burns and Ryan Patel are the Surrey openers at the Micky Stewart Oval.
Ben Coad will take the new ball. Can Yorkshire put a spanner in Surrey's title works? Stay with us to find out.
Rob Yates and Dom Sibley will get Warwickshire started.
Gloucestershire need to start well here to try and get off the foot of the Division One table.
Four slips in place for David Payne.
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E Powell: "#bbccricket, external Why are Surrey allowed to play 3 overseas players and their England players? Why isn’t Root playing?"
Quite a few familiar names missing among the Warwickshire bowling attack, including Mohammad Siraj, but Ryan Sidebottom is back.
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We have a full complement of nine matches for you this week and ball by ball coverage is available as always, courtesy of our 5 Live Sports Extra and BBC local radio teams.
Tune in to a commentary from the promo links at the top of the page and we'll keep you up to date on what's happening at the other grounds with regular text updates.
News of an emergency keeper loan signing by Durham ahead of their Division Two game against Sussex - and he'll have the pads and gloves ready as they have put the visitors in at the Riverside.
Durham sign Warwickshire wicketkeeper Chris Benjamin on loan for the final two games of the County Championship season.
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Image source, Getty ImagesIt is a special week for Surrey, who have renamed their ground the Micky Stewart Oval to mark his recent 90th birthday.
Micky has had a 75-year association with the club as player, captain, coach, cricket manager and president.
He will be presented with the 'Keys to the Oval' in a special ceremony during the tea interval on the second day against Yorkshire.
Stewart also made eight Test appearances during his playing career and was later manager of the England team.
Image source, BBC SportIt is theoretically possible for Surrey to be crowned champions this week, should they win and Hampshire lose to Kent.
The same is not true if those results were reversed - the biggest margin Hampshire could achieve is 16 points and that is assuming Surrey fail to take even one against Yorkshire.
Lancashire and Essex can still catch both, but it will take a very unexpected set of results over the next fortnight for either of them to emerge with the title.
At the bottom, Gloucestershire will be relegated if Kent or Warwickshire pick up eight points or more.
Image source, Getty ImagesA handful of international players will be back in action for their county sides in the penultimate round of games, with Test cricket done and dusted for the summer.
Surrey have England keeper Ben Foakes and batter Ollie Pope in their XI to face Yorkshire, along with fit-again fast bowler Jamie Overton.
Somerset have Overton's bother Craig available for their home game against Northamptonshire, while South Africa spinner Simon Harmer returns to the Essex ranks against Lancashire.
He isn't an international player - yet - but all-rounder Ben Mike makes an early Yorkshire debut after being cleared by Leicestershire to join them on loan ahead of his permanent move for 2023.
Division One
Essex v Lancashire
Lancashire won the toss and will bat
Gloucestershire v Warwickshire
Warwickshire won the toss and will bat
Hampshire v Kent
Hampshire won the toss and put Kent in
Somerset v Northamptonshire
Somerset won the toss and will bat
Surrey v Yorkshire
Yorkshire won the toss and put Surrey in
Division Two
Durham v Sussex
Durham won the toss and put Sussex in
Glamorgan v Derbyshire
Derbyshire won the toss and put Glamorgan in
Leicestershire v Middlesex
Leicestershire won the toss and put Middlesex in
Worcestershire v Nottinghamshire
Notts won the toss and put Worcestershire in
Image source, BBC SportA draw at Worcester which earns Nottinghamshire at least 10 points should make certain of their promotion to Division One - and a win earning a maximum of 22 will be enough for the title.
But they may not need that many if second-placed Middlesex are unable to claim the full 24 from their trip to winless Leicestershire.
Any win would be very welcome at Lord's though, as their closest rivals for second spot, Glamorgan and Derbyshire, meet in Cardiff.
Don't write off Durham and Worcestershire just yet - victory for them could keep their faint hopes of finishing as runners-up alive, should Leicestershire do them a favour at Grace Road.