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
Durham 494-8 v Sussex 266
It's a been a successful morning for Henry Crocombe, who has taken all three Durham wickets to fall.
England's Matthew Potts tries to drive but there is enough swing to take the edge and Oli Carter does the rest.
Graham Clark is still there on 127 not out but is running out of partners.
Leics 11-2 v Gloucs - target 168
Colin Ackermann clips Josh Shaw off his toes. He hasn't got on top of it but it just eludes the left hand of Zafar Gohar at square leg and runs away for four.
Ackermann is off the mark, but that wasn't the most convincing way to do it.
Quote MessageLeicestershire are 11-2 - it could easily have been 7-3."
BBC Radio Leicester's Richard Rae
Northants 232 v Lancs 449-8
To give you an idea of how patient George Balderson was, he was on 91 when Tom Bailey came in. Bailey is currently on 32 from 43 deliveries.
The Lancashire lead is up to 217. They will be eyeing an innings win here, no doubt.
Yorkshire 297 & 242-4 v 247
Shan Masood has oozed class all morning, and looked nailed-on for a hundred at Scarborough, but a stunning catch from Alex Thomson has him heading back to the pavilion.
Masood charges the bowling, and smashes one inches off the ground back towards the bowler. Thomson sticks out a right hand and somehow clings on low down.
Earlier on, James Wharton fell to Sam Conners, but Derbyshire are still in a pretty sticky spot.
Yorkshire now lead by 292, with George Hill and Jonny Tattersall at the crease.
Essex 304 v Middlesex 27-4
Simon Harmer is coming on to bowl the 11th over.
Sam Cook found the edge of John Simpson's bat with the final ball of the previous over but it dropped a yard short of Harmer at second slip.
The pressure is well and truly on for the visitors.
It only took Surrey four overs to complete an innings win over Warwickshire earlier on. Here's a full report of the brief proceedings on day three at The Oval.
Dan Worrall strikes twice as County Championship leaders Surrey take just 15 minutes on day three to wrap up an innings win over Warwickshire.
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Northants 232 v Lancs 446-8
After spending 13 overs in the 90s, the 22-year-old left-hander has finally posted his second first-class century, and what a fine innings it has been. There will be many more.
He has shown patience and maturity beyond his years, especially in a very watchful last hour, as well as some lovely shots, and has helped Lancashire into a commanding position.
His century came from 218 balls, 13 of which found the ropes.
After an age on 99 Balderson narrowly beats a scambling throw from a fielder running in from cover and off comes the helmet and up goes the bat.
Leics 7-2 v Gloucs - target 168
Another batting error by Leicestershire.
Sol Budinger attempts to square cut an angled ball from Josh Shaw, but doesn't move his back foot across and wicketkeeper James Bracey takes a good low catch.
Gloucestershire haven't give up on this one - and they have an extra incentive after losing to Leicestershire in the One-Day Cup semis.
Glamorgan 3-1 v Worcs - target 260
Not an ideal start for Glamorgan in this fourth innings chase.
Eddie Byrom shuffles across his stumps, and Joe Leach, who has been taking the ball away from the left-hander, nips one back and traps him bang in front.
Just one run in the game for Byrom, who won't remember this one with fondness.
Durham 480-7 v Sussex 266
Two in successive overs for Henry Crocombe as Ben Raine tries to pull a short one and top edges to James Coles at mid-wicket.
A bit of a soft dismissal, that one, but Durham are 214 ahead, so it's unlikely to worry them.
Leics 4-1 v Gloucs - target 168
So Rishi Patel won't be reaching 1,00 runs for the season of this match.
The Leicestershire opener drives at a wide one from Josh Shaw and is caught behind.
He knows he shouldn't have been lured into that shot and is clearly annoyed with himself as he walks off.
Essex 304 v Middlesex 25-4
Sam Cook gets in on the act.
Cook zips one through to crash into Jack Davies' pads. He can have no complaints.
The procession continues. John Simpson is the new batter.
Durham 474-6 v Sussex 266
Martin Emmerson
BBC Radio Newcastle
Graham Clark and Bas de Leede added more than 200 runs for Durham's sixth wicket, both making their highest scores for the club in the process.
Clark has 119 and De Leede was out for 103 - the delivery after reaching his century. They steered Durham to maximum batting points as well. It's the seventh time this season.
Their best year with the bat, in terms of bonus points, was in 2009 when they earned 49. They have 45 so far this season with two games to go.
Durham were 265-5 when De Leede joined Clark just before tea yesterday and they trailed by one run. They were 206 ahead by the time De Leede was out. The sun continues to shine, so I am not sure we will see a declaration any time soon.
Hants 308 & 89-2 v Somerset 137
Neil Wagner is bowling as Neil Wagner does, whole-heartedly.
The Kiwi seamer has run in tirelessly this morning, and gets his reward, as Toby Albert gets a leading edge back to the bowler.
The Hampshire opener was trying to work that into the leg-side instead of playing it back down the ground.
Essex 304 Middlesex 21-3
Image source, Rex Features3-7 for Jamie Porter. Sam Robson comes forward but is bowled through the gate and off-stump goes flying
Porter is in the zone here.
Middlesex are in deep trouble. Max Holden joins Jack Davies in the firing line, I mean middle.
Leics 3-0 v Gloucs - target 168
They only need 168 but Leicestershire will surely not go hell for leather for their target on a pitch which has offered help for the seamers throughout the two and a bit days.
Just a couple of singles off the bat and a leg bye in the first two overs, bowled by Josh Shaw and Dom Goodman.
Durham 472-6 v Sussex 266
One delivery after becoming Durham's third centurion of the innings, Basball comes to an end.
Bas de Leede pushes at a ball from Henry Crocombe which leaves him off the pitch and it's a comfortable catch for keeper Oli Carter.
He put on 207 with Graham Clark and the lead is 206.
Northants 232 v Lancs 424-8
George Balderson faced 11 deliveries while on 94 but he never looked particularly nervous and eventually clipped a single into the leg side off Jack White to move to 95 and retain the strike.
The lead is up to 192.
Durham 472-5 v Sussex 266
There it is - a boundary to third man off Henry Crocombe carried Bas de Leede to a maiden Championship century for Durham.
It has taken him 137 balls and that was his eighth boundary, to go with one six.
According to Google translate, 'Well batted' is 'Goed geslagen' in Dutch.
Durham 468-5 v Sussex 266
Bas de Leede strokes another boundary off Jaydev Unadkat and moves to 99 not out.
"He does have a century recently, for the Netherlands in a World Cup qualifer," says BBC Radio Newcastle's Martin Emmerson.
Graham Clark edges the first ball of the next over, bowled by Ari Karvelas, between the slips for four to reach 116 not out - and that is a 200 partnership for the pair.