Stuart Broad and James Anderson on opposite sides as Notts bowl out Lancashire for 214.
Surrey's Gus Atkinson takes 6-68 - his first five-for - for 2022 champions against Essex.
Second-placed Hampshire all out for 229 on day one against Warwickshire.
Australia batter Steve Smith makes debut for Sussex at New Road
Jonny Bairstow takes three catches behind stumps for Yorkshire against Glamorgan.
On-loan paceman Henry Brookes takes 6-20 on debut for Derbyshire.
Derbyshire 119-2 v Leicestershire 122
The run-rate has dried right up in the last seven overs, with just 11 runs added, and of course those two Wiaan Mulder wickets.
Derbyshire remain three runs behind Leicestershire's first innings total.
Worcestershire 264 Sussex 63-1
21 overs left in the day - and off they come.
It looks like Steve Smith will be saved for tomorrow.
Unless the light improves, of course.
Essex 259-8 v Surrey
That's a good shot by Sam Cook, who strokes Sean Abbott through the covers for four.
The Australian digs in a short one, inducing a top edge, but it falls into a gap as two Surrey fielders seem to lose the flight of the ball.
Worcestershire 264 v Sussex 63-1
Ged Scott
BBC Sport at New Road
Umpires Peter Hartley and Chris Watts have just had their first little natter.
And it has got a little gloomy at New Road.
You do wonder just how much longer they will be out there playing.
Worcs 264 v Sussex 55-1
Just one run from the past couple of overs at New Road. There are 22 more due in the day and Sussex need to strike a balance between boosting their total and preserving wickets. Ali Orr is 25 not out and Tom Alsop has 11.
Notts 58-4 v Lancashire 214
George Balderson does the trick again!
Joe Clarke edges behind to the wicketkeeper to leave Notts 58-4 and Lancashire's 214 is looking a more and more competitive total by the over.
The hosts just need someone to stick around with Haseeb Hameed for a while - he's looked pretty solid while others have departed at the other end.
Yorkshire 0-0 v Glamorgan 245
Yorkshire have started their reply to Glamorgan's first innings total of 245.
Having spent close to 72 overs behind the stumps, Jonny Bairstow is down on the card to come in at number five.
Image source, Rex FeaturesEssex 250-8 v Surrey
They've made heavy weather of it - appropriate really given the forecast for the next couple of days - but a single by Sam Cook secures a first batting point for Essex.
Surrey are set to take the new ball and Kemar Roach is doing a bit of stretching.
Yorkshire v Glamorgan 245
Glamorgan's innings ends on 245 as Jamie McIlroy is caught at slip off the bowling of George Hill, who ends with 3-62.
Yorkshire will probably have about an hour and a half to eat into that deficit before the close.
Notts 52-3 v Lancashire 214
It felt like that Lancashire bowling pressure was going to tell eventually and Matthew Montgomery is gone.
George Balderson traps him lbw with one that nips back.
Joe Clarke is next in to join Haseeb Hameed, who is unbeaten on 32.
Hampshire 229 v Warwickshire 10-0
Slow going for Rob Yates and Alex Davies with Mohammad Abbas and Kyle Abbott in suffocating form.
A bit of light relief as James Fuller takes a spectacular comedy tumble as he chases Davies' clip through mid-wicket off Abbott.
The ball reaches the rope and Warwickshire are into double figures in the eighth over.
Essex 245-8 v Surrey
Another one gone at Chelmsford and at this rate, Essex might not even manage one batting point.
Great fightback by Surrey since tea - and that is why they are a champion team, they have a champion mentality.
Four wickets now for Gus Atkinson as he bowls Shane Snater, who appeared to be trying to hit it away over mid-on - a career-best performance.
Essex 245-7 v Surrey
Rory Burns caught a blinder earlier. That was an easier slip chance but he fails to take it and Simon Harmer survives. Will Jacks is the unlucky bowler but can hardly complain as Burns is his captain.
Notts 49-2 v Lancashire 214
Will Williams has bowled six overs and five of them have been maidens. He's been probing and probing and so far unable to take wicket of his own, but it's the sort of pressure that might earn a wicket at the other end.
Derbyshire 108-2 v Leicestershire 122
Two in four balls for Wiaan Mulder who gets one to straighten up on the new man Brooke Guest, beating his back-foot defence and uprooting his off-stump.
Wayne Madsen is in at five and Mulder beats Madsen's outside edge as he finishes with a double-wicket maiden.
Derbyshire 108-1 v Leicestershire 122
The century opening stand is broken as Wiaan Mulder gets one to nip back at Haider Ali to pin him and end his swashbuckling knock.
He made 54 from 68 with seven fours but is back in the pavilion.
Harry Came is joined by Brooke Guest with the deficit just 14 runs.
Essex 241-7 v Surrey
Doug Bracewell is down the track and lofts Will Jacks away over long-off for six.
The next over, though, sees his downfall as he plays on to Gus Atkinson, who picks up his third wicket.
Shane Snater comes to the crease with the new ball due in only a handful of overs.
Yorkshire v Glamorgan 228-9
Yorkshire are now one wicket away from wrapping up this Glamorgan innings at Headingley, as Matt Fisher makes the first breakthrough after tea.
Adam Lyth dropped a very catchable chance earlier in the day, but he makes no mistake here to remove James Harris.
Worcs 264 v Sussex 37-1
Josh Tongue overpitches and Ali Orr whips it away through mid-wicket for four. A single follows but then Tom Clark is gone, edging the Worcestershire seamer to the keeper as he tries to drive.
Tom Alsop is next and Steve Smith - who is down to bat at five - may be contemplating the putting on his pads.
There is a major debate going on at the moment about the future of cricket. We'll let you form your own conclusions about this idea.
In order for Test cricket to survive it may need to become short once-a-year-events like Wimbledon, says Rajasthan Royals lead owner Manoj Badale.
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