Nine matches: five in Division One, four in Division Two
First v second in Division One as Surrey play Notts at The Oval
Tom Abell & Kasey Aldridge hit 100s for Somerset against Hampshire
Essex's Charlie Allison out for 98 against Warwickshire
Bottom two facing each other: Durham v Worcestershire
Rishi Patel scores 114 for Leicestershire - Corey Flintoff makes red-ball debut for Kent
Glamorgan will be promoted if they win against Derbyshire with at least 19 points
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Leics 151-2 v Kent
Richard Rae
BBC Radio Leicester Sport
Lovely swing from Corey Flintoff but what he hasn't done yet really is bring one back off the seam, make the batsman worried in that respect.
But he can do both. There's been some lovely outswing from him, he's bowling beautifully at the moment.
Warwicks v Essex 90-1
Image source, Rex FeaturesA good morning for Essex after they lost the toss and were asked to bat.
There's been some playing and missing but the home side only have the wicket of Paul Walter so far.
Dean Elgar has been doing Dean Elgar things to go to lunch at 44 not out.
The Bears need wickets if they're to force their way into the title race.
Another one gone at Derby with Glamorgan skipper Sam Northeast lbw to Zak Chappell for 25. The Welsh county are 57-3 in the 23rd over.
Northants are 84-3 after 27 against Gloucestershire with Lewis McManus 36 not out as a makeshift opener and Saif Zaib has 16.
Surrey 141-6 v Notts 231
Image source, Rex FeaturesWhat a morning!
A 50 partnership between Rory Burns and nightwatchman Tom Lawes seemed to set things up for Surrey but Notts have come roaring back.
When Lyndon James finally got rid of Lawes it precipitated a rush of five wickets for 28 runs including those of Burns, Ben Foakes, Dan Lawrence and Ollie Pope.
James has starred with three wickets with Brett Hutton taking two.
Surrey still trail by 90 runs.
Engrossing stuff.
Leics 134-2 v Kent
Little margin for error on this pitch, it would appear, and Rishi Patel stands tall and punches Corey Flintoff away to the cover boundary before pinching a single from the next. He advances to 76 not out.
Warwicks v Essex 84-1
A big shout from Olly Hannon-Dalby as he thwacks one into Dean Elgar's pads but it's not out.
We've got 10 minutes until the interval.
Surrey 137-6 v Notts 231
Tom Curran drives in the air for four runs down the ground.
Dillon Pennington then goes past his edge.
Every ball seems to have something going on.
Rew b Fuller 30 (Somerset 69-4 v Hants)
Big wicket for Hants but James Rew will be disappointed he was not more positive here.
James Fuller has been tidy in his three overs and he hangs one outside off stump that Rew prods at, getting an inside edge on to his stumps.
He tilts his head back and looks at the sky as he walks off as he was looking good for his 30 runs.
Sussex v Yorks 77-1
A show of intent by Mayank Agarwal.
A low full toss from spinner Jack Carson is lofted down the ground by the Indian but it falls just inside the rope and he has to settle for four.
Leics 123-2 v Kent
Richard Rae
BBC Radio Leicester Sport
Corey Flintoff's first ball in first-class cricket was a good one. He is a tall right-hander and it was straight on off stump.
Surrey 132-6 v Notts 231
Ryan Patel plays and misses at the final ball of the latest over from Lyndon James.
Surrey do bat deep but Notts have burst through the middle order.
It's all a far cry from the 50 partnership we saw between Rory Burns and Tom Lawes.
Dillon Pennington returns to the attack for the visitors.
Surrey 131-6 v Notts 231
Mark Church
BBC Radio London commentator
We've seen it here before - you can get a rush of wickets. If you get it right with the ball, this can happen.
Lyndon James has put it on a good length with a little bit of movement away and Ollie Pope looked for the drive - big edge, Freddie McCann with a very safe catch at second slip.
This brings out Tom Curran for his first innings of the Championship summer
Leics 123-2 v Kent
Now then - a big moment for Corey Flintoff, his first bowl in a County Championship game.
He certainly doesn't appear to have the pace of his dad but the first one is on target and dead batted by Rishi Patel.
Lancs v Middx 13-2
This is frustrating.
No sooner had Lancashire got sight of Middlesex captain Leus de Plooy and they are off as a heavy shower sweeps in.
Surrey 131-6 v Notts 231
Mark Church
BBC Radio London commentator
Credit goes to Notts. I think they didn't get it right in the first hour but they've turned it around now.
So there is some work for Ryan Patel to do alongside Tom Curran.
Surrey 131-6 v Notts 231
Tom Curran has joined Ryan Patel at the wicket for Surrey.
This game has been turned on its head.
Lyndon James has 3-30.
The home side still trail by 100 runs.
We won't even talk about tomorrow's weather forecast...
Hollman c Jones b Anderson 9 (Lancs v Middx 12-2)
And that is vintage Anderson...
Over the wicket, angled across the left-hander Luke Hollman, pitched just short enough to draw the bat forward then leaves the pitch, takes the edge and settles in Michael Jones's hands at first slip.
Beautiful.
Bean c Simpson b Hudson-Prentice 27 (Sussex v Yorks 69)
Gone.
Finlay Bean slashes at a ball from FHP and edges through to the keeper - he'll be unhappy with himself about that one.
India's Mayank Agarwal comes out at number three and, unlike his golden duck last week, is immediately away with a single.
Northants have lost their third wicket at Bristol, with James Sales brilliantly caught at first slip by Ben Charlesworth off Josh Shaw - they are 71-3 in the 23rd over against Gloucestershire.
Glamorgan are 47-2 in the 19th against Derbyshire, with Sam Northeast 21 not out and Kiran Carlson on 11.
Pope c McCann b James 11 (Surrey 129-6 v Notts 231
Image source, Rex FeaturesOooh, risky from Ollie Pope.
He shoulders arms to a Lyndon James delivery and there's a loud shout for lbw but it's not quite doing enough.
Oh, out next ball!
James finds the edge and the England vice-captain has to go and punches his bat as he walks away.
Five wickets have fallen for 28 runs.
Two bowling points for Notts as well.