127 wickets fall across nine matches in both divisions
Champions Essex fight back with ball against Lancashire after making just 150
Australia's Matt Renshaw scores 100 on debut for Somerset v Worcestershire
South Africa opener Aiden Markram makes a pair on the same day on his Durham debut
Surrey 187-5 (64.1 overs) v Hampshire
First ball back after tea!
Kyle Abbott wastes no time, pinning Ollie Pope in front straight away. A good innings from the youngster ends and in comes another - Sam Curran joins Ben Foakes in the middle.
Image source, Getty ImagesSomerset 202 v Worcestershire 17-3 (5 overs)
Golden duck for Joe Clarke!
Lewis Gregory is on fire. Full, straight and quick, the ball thumps into Clarke's front pad and the umpire's finger shot up.
Somerset 202 v Worcestershire 17-2 (4.5 overs)
What a beauty! Lewis Gregory follows an over of gentle outswingers with a hooping, quicker inducker which beats Brett D'Oliveira all ends up, taking his off-stump.
Lovely stuff from Gregory.
Surrey 187-4 (64 overs) v Hampshire
Kevan James
Sport Presenter, BBC Radio Solent
Image source, Getty ImagesBen Foakes (pictured above) and Ollie Pope currently share an unbroken fifth-wicket partnership of 73 as a combination of an older ball and a hot sun begin to have an effect on this Oval pitch.
There's been life in it all day and Edwards (3-35) has been the pick of the bowlers.
Chris Wood picked up his 100th first class wicket when he had Dean Elgar caught behind in that session. It was his first championship wicket since April 2016 after suffering from a few injuries.
Cheers Felix, sterling work in the afternoon sunshine (not literally of course).
We're set for a long evening as well in some of these matches as there's still plenty of overs to be bowled.
Always the way when wickets tumble....
After a typically staggered tea break all over the country I'll hand you back into the capable hands of Adam Williams, who will guide you through the next events.
Somerset 202 v Worcestershire 12-1 (2.4 overs)
Safe hands from James Hildreth at first slip. He does for Daryl Mitchell who edges Lewis Gregory into the cordon.
A blow for the visitors, who lose their most experienced batsman early on.
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Sussex 160-4 (64 overs) v Leicestershire
Adrian Harms
Sports reporter, BBC Sussex
A good session for Sussex taking the score from 52-3 to 160-4, led by Luke Wright who after a first ball duck at Edgbaston last week has batted beautifully reacing 55 not out at the interval
Leicestershire have continued to bowl with good control and imagantive captaincy from Michael Carberry and the new ball ball is due in just 16 overs
As for the cake: a thank you to Leicestershire supporter Sally. This looks fantastic!
Image source, BBC SportGreat cake at Leicester
Essex 150 v Lancashire 19-3 (9 overs)
Image source, Rex FeaturesIt's three wickets in the bag already for Essex and Jamie Porter.
Haseeb Hameed is the latest to depart as he gets a fine outside edge on to a decent ball that goes through to James Foster's gloves.
Great reply from the champions and their strike bowler from last season.
Yorkshire 198-8 (64 overs) v Nottinghamshire
Isabelle Westbury
BBC Sport at Emerald Headingley
Image source, Getty ImagesA half-century from Yorkshire wicketkeeper Andrew Hodd halted the fall of wickets in the afternoon session after the home side resumed after lunch on 107-5.
A probing spell from the Notts seamer Luke Fletcher was rewarded with the wickets of Jack Leaning and Tim Bresnan, but he’ll be looking for support from the other bowlers to remove the final two Yorkshire wickets after tea.
Somerset 202 v Worcestershire 8-0 (1 over)
Worcestershire have begun their reply to Somerset's 202 all out, with Daryl Mitchell and Brett D'Oliveira at the crease.
Craig Overton and Lewis Gregory are bowling.
Durham 91 v Kent 112-4 (33 overs)
Adam Whitty
BBC Radio Kent
It was all going so well from a Kent perspective.
Heino Kuhn and Sean Dickson seemed to be loving life, and had taken the visitors to 67-1 under blue skies in Durham.
A lot rests on the performance of Heino Kuhn (looking a little dreamy in this picture)
But the wickets of Dickson, Denly and Crawley, all falling in the space of 13 runs, rocked the boat somewhat.
At the tea break, Kent lead by 21 runs, and it falls to Kuhn and Darren Stevens to rebuild the innings.
Both old hands, but face a challenge in these fresh and swing-friendly conditions.
Division One:
Chelmsford: Essex 150 v Lancashire 9-1 - Uncontested toss
Taunton: Somerset 202 v Worcestershire 1-0 - Uncontested toss
The Oval: Surrey 187-4 v Hampshire - Surrey won the toss
Emerald Headingley: Yorkshire 198-8 v Nottinghamshire - Uncontested toss
Division Two:
Derby: Derbyshire 243-7 v Middlesex - Uncontested toss
Emirates Chester-le-Street: Durham 91 v Kent 112-4 - Uncontested toss
Bristol: Gloucestershire 172-7 v Glamorgan - Uncontested toss
Leicester: Leicestershire v Sussex 160-4 - Sussex won the toss
Northampton: Northamptonshire 147 v Warwickshire 28-3 - Northants won the toss
Not quite tea in every game, but now seems as good a time as any to give you a glance at where all the games are....
Surrey 187-4 (64 overs) v Hampshire
Ben Foakes and Ollie Pope have batted pretty much without scare. They've put on 73 runs together to calm things from 114-4.
Surrey will be happy at tea.
Essex 150 v Lancashire 16-2 (6.3 overs)
Image source, Rex FeaturesJamie Porter in the wickets again as Essex's strong start with the ball continues.
Alex Davies mistimes a drive to mid-off and into the hands of Ryan ten Doeschate to give Porter a second early wicket.
Gloucestershire 172-7 (64 overs) v Glamorgan
Bob Hunt
BBC Radio Gloucestershire at Bristol
Honours just about swung Glamorgan’s way at Bristol on tea when Ryan Higgins mistimed a pull from Marchant de Lange in to the hands of Sean Marsh at short mid-wicket for 43.
At 172-7, Gloucestershire will at least be aiming for their first batting point of the season on a pitch that is still assisting the bowlers despite the Spring sunshine.
Kieran Noema- Barnett is their last recognised batsman. He’s on 27.
Surrey 181-4 (61 overs) v Hampshire
Ollie Pope rocks back and cuts Liam Dawson twice behind square for four. The youngster moves onto 32*, with Ben Foakes on 31*.
It's looking much easier for Surrey out there now, with tea approaching.
Yorkshire 191-8 (61 overs) v Nottinghamshire
A promising eighth-wicket partnership of 36 for Yorkshire is ended as Josh Shaw falls to Harry Gurney.
Tom Moores snaffles the edge behind to give Gurney his second wicket of the innings.
Wicketkeeper Andy Hodd at the other end has picked up a half-century.
Somerset 202 v Worcestershire
Anthony Gibson
BBC Somerset
Image source, Getty ImagesSomerset’s 202 all out is maybe 50 fewer than they’d have liked, and 50 more than they feared after being reduced to 7-2.
Hats off to the new Taunton Aussie, Matt Renshaw, for 100 on debut. He played really well as the other Somerset batting (James Hildreth honourably excepted) crumbled around him in seam-friendly conditions.