Dan Worrall takes 5-25 as Surrey defeat Warwickshire by an innings and 97 runs
Jamie Porter takes 6-34 as Essex earn a 125-run first innings lead over Middlesex
George Balderson scores second Championship century for Lancashire
Hampshire's Nick Gubbins scores 139no as they leave Somerset a target of 502
Colin Ackermann hits 93 not out as Leicestershire beat Gloucestershire
Billy Root makes unbeaten 84 but Glamorgan lose to Worcestershire
Dutch all-rounder Bas de Leede hits maiden hundred for Division Two leaders Durham
Matthew Revis scores 106 as Yorkshire set Derbyshire distant target of 571
Yorks 297 & 513-8 v Derbys 247
A single, turned round the corner off Alex Thomson, brings up Matthew Revis' century from 140 balls.
It's his second in the Championship this season and he celebrates with a six two balls later.
Northants 232 & 114-3 v Lancashire 524
No runs conceded by the spin of Tom Bailey. He's enjoying himself today but Lancashire will be desperate to make further inroads in the 32 overs remaining.
Sam Whiteman (33) and Rob Keogh (11) have dragged the hosts within 178 runs at the interval.
Northants 232 & 113-3 v Lancashire 524
Paceman Tom Bailey is bowling finger spin in the last over before tea.
Got to love the little quirks of county cricket on a baking hot weekday afternoon.
Essex 304 & 4-0 v Middlesex 179
Josh de Caires, who is seeking 18 wickets for the match, remember, opens the bowling from the other end.
He's bowling to one of England's best ever opening batters - just as he's probably done in the garden countless times...
Worcs 284 & 145 v Glamorgan 170 & 179
Logan van Beek goes straight through Jamie McIlroy's defences, and knocks leg stump out of the ground to claim the final wicket.
Van Beek has been superb in this game, taking four-fer in both innings, as well as reaching 50 with the bat.
Jubilant celebrations in the middle from the Worcestershire players, who know that they've taken a big step towards a potential promotion here.
Billy Root is left stranded for an excellent 84, but in truth, Glamorgan never looked like reaching the victory target of 260.
Glamorgan 179-9 v Worcs - target 260
Billy Root can't find a single, and Worcestershire will have a full over to bowl at Jamie McIlroy...
Essex 304 & 0-0 v Middlesex 179
Alastair Cook and Nick Browne head out to begin building what they hope will be an unassailable advantage.
Ethan Bamber gets the new ball for Middlesex, who were 125 adrift after their first innings.
Northants 232 & 104-3 v Lancashire 524
Ticking off the milestones, though they still trail by 188.
Sam Whiteman has 28 with Rob Keogh on seven.
Glamorgan 173-9 v Worcs - target 260
Billy Root goes to reverse sweep Jake Libby's off-spin, and connects well, but Adam Hose had anticipated the shot at slip.
He positions himself perfectly, but can't claim the rebound after parrying it up in the air.
Glamorgan still need an improbable 87 more to win.
Yorkshire 297 & 511-8 v Derbyshire 247
Matthew Revis will have to tuck into his tea unbeaten on 98.
Can the fifth half-centurion of the day become the first into three figures?
Matthew Fisher has 10* at the other end and the Yorkshire lead is an almighty 561.
Glamorgan 196-9 v Worcs - target 260
Timm van der Gugten pushes forward at Joe Leach and gets a healthy edge to Adam Hose at first slip.
It's a good low catch coming forward, and Worcestershire are on the verge...
It has to be said that Van der Gugten tore his hamstring on day one - impressive that he came out to bat at all.
Durham 505-9 dec v Sussex 266 & 123-4
Oli Carter square cuts Bas de Leede for four, then glances George Drissell for another in the next over.
It's three in three as he runs Ben Raine down past the solitary slip to post a 50 stand with Cheteshwar Pujara.
Carter is 39 not out, now just one run behind his partner.
Hants 308 & 330-3 v Somerset 137
Nick Gubbins and Tom Prest head to the pavilion to warm applause from the home crowd.
The Hampshire pair have put on 79 for the fourth wicket since the loss of James Vince, and have guided their side to a position of total dominance.
The Somerset players are trudging their way off, hoping and praying for a Hampshire declaration - the lead is 501.
Northants 232 & 96-3 v Lancashire 524
Sam Whiteman gets down to punch an over-pitched delivery from spinner Tom Hartley away through the covers for a nice boundary to move to 28.
Rob Keogh has scored one from his first 10 deliveries.
Northants trail by just 196 now.
Glamorgan 166-8 v Worcs - target 260
The curse of the live texter strikes.
James Harris goes for a booming cover drive, but instead edges through to Jack Haynes at second slip.
Timm van der Gugten joins Billy Root.
Glamorgan 161-7 v Worcs - target 260
James Harris tucks one off his hip for a single to take the runs required for Glamorgan under 100.
Billy Root is holding things together very nicely indeed. They couldn't, could they?
Essex 304 v Middlesex 179
Jamie Porter picks up 6-34 after pinning Ethan Bamber plumb in front.
Middlesex are all out and trail by 125. Josh de Caires finishes unbeaten on 29 from 33 deliveries. Quite a game for him, so far.
Middlesex cannot earn a batting bonus point, however. If they lose they will take just three points from the match.
That will be an early tea...
Yorkshire 297 & 498-8 v Derbyshire 247
Yorkshire continue to bat on at Scarborough.
Jordan Thompson was dismissed by Alex Thomson for an eye-catching 64 not long ago, which included four sixes - that was the fifth half-century of Yorkshire's second innings.
Matt Revis is still at the crease on 90, and you suspect that as and when he reaches three figures, Yorkshire will declare.
The lead currently sits at 548.
Durham 505-9 dec v Sussex 266 & 100-4
Having scored a hundred earlier in the day, Bas de Leede is now going to have a turn with the ball for Durham.
His first delivery is run down through the gap between first slip and gully by Oli Carter and brings him four runs.
A single by Cheteshwar Pujara at the start of the next takes the score into three figures. Sussex are 139 behind.
Northants 232 & 82-3 v Lancashire 524
A disappointing day for Luke Procter against his former club.
He's back in his crease, shuffling across towards off, trying to play across the line and has been hit in line by Will WIlliams. He survived a big appeal from the previous delivery but not many complaints here.
Rob Keogh is the new batter.