Defending champions Surrey draw with Essex after being set 273 to win.
Chris Rushworth has match figures of 10-76 as Warwickshire beat Hampshire
Notts hang on for draw with Lancashire with one wicket left.
Sam Whiteman scores unbeaten 130 as Northants draw with Somerset
Jonny Bairstow out for nought for Yorkshire against Glamorgan, Adam Lyth hits 174
Ollie Robinson takes 7-48 - and 14 wickets in the game - but Sussex draw at Worcester
Leicestershire extend their unbeaten record with draw at Derby.
Essex 314 & 198 v Surrey 240 & 118-6
Another over ticks by at Chelmsford as Matt Critchley sends down a maiden to Cameron Steel. There are 14 more to come, and it looks we're about to have a ball change.
Simon Harmer will continue at the other end and this is the kind of field he is employing.
Image source, Rex FeaturesNotts 124-7 (target 295) v Lancs
Just 10 overs left at Trent Bridge for Lancashire to pick up these last three wickets and force victory.
Brett Hutton is still there on 23 not out, after almost two and a half hours, and Stuart Broad is at the other end, yet to score.
So far Broad has successfully kept out Jimmy Anderson, ducking to avoid what was meant to be a slow bouncer and ended up hitting him gently on the back.
Derbys 350-7 dec v Leics 122 & 273-8
Time now starting to run out for Derbyshire.
Two singles from the latest Henry Brookes over and Leicestershire have 11 more to survive.
Their lead is 45 - and don't forget that we'd lose a couple of overs between innings should they be bowled out.
Matches start Thursday 11 May
As we enter the final stages of our four remaining matches, here is the full list for the next round of the County Championship.
Division One
Canterbury: Kent v Hampshire
Old Trafford: Lancashire v Somerset
Northampton: Northamptonshire v Nottinghamshire
The Oval: Surrey v Middlesex
Edgbaston: Warwickshire v Essex
Division Two
Derby: Derbyshire v Gloucestershire
Riverside: Durham v Yorkshire
Cardiff: Glamorgan v Worcestershire
Leicester: Leicestershire v Sussex
Worcs 264 & 251-8 v Sussex 373
Image source, Getty ImagesAzhar Ali finally completes his century with a boundary off Steve Smith and that's that.
The captains shake hands and it's totally down to Azhar's six hours-plus stay at the crease that Worcestershire have escaped with a draw here.
Ollie Robinson did his very best to win it for Sussex with seven wickets in each innings - and career-best match figures of 14-117.
Surrey 115-6 - target 273
It's going to be spin from both ends by Essex.
Matt Critchley replaces Jamie Porter and, unlike Simon Harmer, will be turning it away from the two right-handers.
Somerset 412 v Northants 255 & 311-8
Handshakes at Taunton.
Sam Whiteman is the hero for Northants, finishing 130 not out, as the visitors bat through the final day.
Tom Taylor added an excellent 53 in a stubborn eighth wicket partnership that frustrated Somerset and denied them the chance of a chase.
Image source, Getty ImagesSurrey 115-6 - target 273
Another boundary for Jamie Smith off Jamie Porter, but the real threat to Surrey at the moment is coming from Simon Harmer at the other end. But he can only bowl nine more overs, with 18 left in the match.
Notts 122-7 (target 295) v Lancs
It had to be Jimmy Anderson, didn't it?
Joe Clarke flicks him straight into the hands of leg slip and the partnership of 67 is finally ended.
Here comes Stuart Broad to face his Test bowling partner...
Surrey 111-6 - target 273
Another testing over from Simon Harmer, but Cameron Steel hangs on for Surrey. Another 19 overs to be bowled.
Somerset 412 v Northants 255 & 310-8
Tom Abell has dropped Sam Whiteman at first slip, and with that, Somerset's hopes of victory grow ever smaller.
Jack Leach draws the edge, but it hits Abell on his right wrist and goes to ground.
Derbys 350-7 dec v Leics 122 & 262-8
The new ball does the job for Derbyshire as Peter Handscomb checks a drive and Wayne Madsen shows the reactions of a man several years younger at second slip to take a sharp catch.
A good innings by Handscomb but Leicestershire are only 34 ahead as Michael Finan joins Chris Wright.
Yorks 325-6 - target 492
Jordan Thompson defends solidly into the off-side.
McIlroy can't replicate Michael Neser's achievement from Yorkshire's first innings.
He's given Glamorgan a sniff of victory though.
Surrey 111-6 - target 273
Two close catchers on the leg side as Jamie Porter bounds in for a new over but Jamie Smith steers the ball past leg slip for four runs. He moves to 23 not out.
Yorks 325-6 - target 492
Gone first ball - a king pair for Dom Bess!
Jamie McIlroy swings one back, and that is absolutely plumb. No arguments there.
McIlroy is on a hat-trick...
Notts 119-6 (target 295) v Lancs
Lancashire are rotating their bowlers in a bid to break this seventh-wicket stand at Trent Bridge.
Luke Wells' leg-breaks have been pressed into service as well, but they still can't find a way through as they press for these last four wickets.
Is the scene set for Jimmy Anderson to return for a final burst and wrap up his side's first win of the season?
Yorks 325-5 - target 492
A brilliant knock comes to an end.
Jamie McIlroy gets one through Adam Lyth's defences onto his front pad, and the Yorkshire captain has to go. Might have been a touch high, but the umpire thinks that would have hit the stumps
Dom Bess joins Saud Shakeel in the middle.
Worcs 264 & 243-8 v Sussex 373
You have to admire Ollie Robinson's tenacity - he's returned to the field for one last push but he's now pulled up in the middle of his first over back.
The bowler, who was feeling his hamstring earlier, is now limping off the field again and that surely will be it for him in this match.
Sussex - and England - will hope there are no longer-term ramifications.
Surrey 105-6 - target 273
Simon Harmer is really giving it a rip.
Cameron Steel picks up his first run to mid-wicket and is probably very relieved to do so.
There are 23 overs for Surrey to survive - scoring 7.3 an over to win the game is surely now no more than a mere statistic.
Derbys 350-7 dec v Leics 122 & 255-7
This one isn't over yet as Derbyshire are approaching the new ball.
Just a single from the latest Luis Reece over and Leicestershire lead by 27.