Jamie Smith hits 166 and Ollie Pope 103 as Surrey rack up 400 against Leics
Jack Haynes' 100 rescues champions Notts at home to Glamorgan
Durham opener Ben McKinney scores maiden double century, an unbeaten 214 against Gloucestershire as visitors post 456-2
Top three Ricardo Vasconcelos, Luke Procter and Calvin Harrison all hit tons for Northants against Kent
Four wickets for new county Derbyshire for Shoaib Bashir away to Lancs
Wickets tumble in matches between Essex and Somerset, Yorkshire and Hants and Middlesex v Worcs
Honours even in contest between Sussex and Warwicks
Sussex v Warwickshire 220-6
The Bears' number eight follows his number seven there soon after.
Tom Haines' medium pace, with John Simpson stood up, dots Chris Woakes up for three balls on 49*, but he gets there with a one to deep cover off the fourth.
Woakes has hit eight fours and one six and gets there off just 62 balls.
The pitch flattening out in the Hove sunshine.
Surrey 263-3 v Leics
Image source, ShutterstockJamie Smith is 109* for Surrey
A single to end the session for Surrey and the hosts go into the tea break in a very commanding position.
Jamie Smith remains unbeaten on 109, while Ollie Pope made a fine 103 in a 200-run partnership for the third wicket.
Surrey will hope to put their foot on the gas once more in the evening session.
Long old day for Leicestershire so far.
Surrey 262-3 v Leics
The last over before tea and Dan Lawrence comes down the pitch to hit Ajaz Patel over mid-on for four.
Abbott lbw b Hill 0 (Yorks v Hants 222-8)
And another falls the same way as George Hill grabs a fourth, trapping Kyle Abbott.
Sussex v Warwickshire 219-6
Tom Price has 2-57 off 12 overs, his first two wickets for Sussex, but he along with his seven other bowlers used today cannot get past these two.
Kai Smith has 51* off 67 balls as we are just three overs from the tea interval thanks to the decent amount of spin already bowled today.
These two making Ed Barnard's decision to bat first look more sensible now than it looked at lunch!
Notts 264-8 v Glamorgan
Jack Haynes will be hoping he doesn't run out of partners here. He only needs another five for his century.
Yusuf lbw b Hill 8 (Yorks v Hants 222-7)
George Hill gets one to nip back sharply and Codi Yusuf has laid no bat on that. Not much doubt about that and David Millns finger goes up.
Surrey 251-3 v Leics
Dan Lawrence picks up a single off Ajaz Patel and Surrey pick up their first batting point.
Hutton c Cooke b Hadley 25 (Notts 243-8 v Glamorgan)
The perfect comeback delivery for Ryan Hadley!
He finds the outside edge of Brett Hutton's bat and Chris Cooke takes the catch behind the stumps.
A quickfire 25 for Hutton and Glamorgan are pushing through the lower order now.
Notts 262-7 v Glamorgan
Brett Hutton is onto it quickly from Ryan Hadley and pulls it powerfully away for four through the leg side.
His 25 has already been a useful contribution for Notts.
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If Jamie Smith continues to score runs for fun for Surrey then he must play for England but where? He is not good enough as a keeper so there are 2 options in my view. Bethel pays for playing in the IPL or he opens.
Chris, Dorset
Middlesex v Worcestershire 191 all out
Ryan Higgins removes Adam Finch to end the Worcestershire innings on 191 as he finishes with a more-than-useful 3-39.
An excellent effort from Middlesex after asking the Pears to bat at half 10 this morning.
Let's see if Tom Taylor and co can make any inroads into the home batting in the final session.
Surrey 248-3 v Leics
Fair enough, Dan Lawrence.
Defends his first ball from Ajaz Patel, comes down the ground and smashes it for six over long on the next.
That's one way to get off the mark.
Thomas c Pepper b Cook 4 (Essex 149 v Somerset 16-3)
Josh Thomas gone now too.
Groping outside off stump, it bounced and left him, not quite the pitch he top scored on on his debut here in September and Sam Cook has his second.
Will Will Smeed make it before the end of Somerset's first innings?
Somerset must hope there is no traffic on the M4 or M25, or for some better batting until close.
Gloucestershire v Durham 311-2
Martin Emmerson
BBC Radio Newcastle
Alex Lees and Ben McKinney came ever so close to breaking the record for Durham's highest opening stand - eventually falling short by just 10 runs.
They took Durham to 305 before Lees was bowled by Will Williams on 129. So, their highest opening stand remains the 314 scored by Michael Di Venuto and Kyle Coetzer against Notts in 2009.
On that occasion, Durham beat the visitors in Chester-le-Street by an innings, as they retained their County Championship title in a season which saw them go unbeaten in the four-day game.
Ben McKinney can still break the record for the youngest double centurion at Durham, though. He currently has 161.
Meanwhile Emilio Gay has just been caught at first slip by Cameron Bancroft, off Williams, for five. Just like buses, eh?
Notts 257-7 v Glamorgan
Brett Hutton clumps it for four away off Timm van der Gugten and these are all very valuable runs for Notts.
Hutton is onto 21 from 27 balls. Jack Haynes is within six of a century at the other end (94*).
Surrey 242-3 v Leics
Image source, ShutterstockOllie Pope and Jamie Smith's stand finally comes to an end for Surrey.
A partnership of exactly 200 runs for that third wicket.
Sussex v Warwickshire 205-6
The Bears get to 200.
A reverse sweep from Kai Smith for four showing some of the shots he has unfurled in the One-Day Cup in recent summers.
Consecutive boundaries to start Jack Carson's most recent over.
The last wicket fell on 117-6, a crucial partnership for the away side this.
Pope c Cox b A Patel 103 (Surrey 242-3 v Leics)
At long last for Leicestershire!
Ajaz Patel gets one to grip and it turns just that little bit more than it has been, catching the outside edge of Ollie Pope's bat as he nicks off to Ben Cox behind the stumps.
A much-needed breakthrough and Pope is gone for a fantastic 103.
Notts 252-7 v Glamorgan
Nottinghamshire have dug deep to grind out their first batting point of the game.
It did not look on the cards at 103-6.