Joe Root and Alastair Cook out for ducks as 22 wickets fall at Chelmsford
Yorkshire all out for 50 and Essex make 142 in reply
James Vince falls for five for Hampshire against Notts
Trescothick & Bartlett score 100s for Somerset against Lancashire
Rory Burns hits century for Surrey against Worcestershire
Dawid Malan out for 13 for Middlesex against Sussex
Ollie Robinson takes 7-54 for Sussex, the day's best figures
Somerset 294-4 (86.3 overs) v Lancashire
An important wicket for Lancashire at Old Trafford as George Bartlett goes after compiling a maiden first-class century as Liam Livingstone takes a superb slip catch. He hit a six and 13 fours and put on 79 with Tom Abell, who has now been joined by Steven Davies.
Somerset 294-3 (86 overs) v Lancashire
He made a century earlier in the day at Old Trafford, but Marcus Trescothick is now in hospital. Let's hope the injury isn't anything serious.
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Glamorgan are fighting back with the ball after being dismissed for just 94 by Kent. The visitors are 115-5 in reply, with Timm van der Gugten having taken 4-27 so far for the Welsh county.
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Leicestershire have advanced to 259-4 against Durham at the Riverside with Mark Cosgrove four runs short of a half-century. Ned Eckersley was the last man to go, lbw to Barry McCarthy for nine.
Seamer Tim Murtagh has disposed of both Sussex openers at Hove, with the home side 12-2 in reply to Middlesex's 230 all out.
On day two at Edgbaston, Warwickshire have taken the lead against Derbyshire, moving on to 324-5, with Jonathan Trott 59 not and Matt Lamb on 56. Their stand is now worth 118.
Nottinghamshire 302 v Hampshire 13-1 (7 overs)
England batsman James Vince has begun his innings at Trent Bridge watchfully, taking just two singles off 14 balls so far.
With his other national teammates struggling with the bat across the country, a good score for Vince could help solidify his place in the line-up ahead of this summer.
Yorkshire 50 & 53-0 (11 overs) v Essex 142
Yorkshire need less than 11 overs to beat their first-innings score - and they do it with all 10 wickets intact, which is quite remarkable given events at Chelmsford earlier today. Jonny Bairstow has made 39 off 35 balls, with a six and five fours, and Adam Lyth, on 10, is seemingly content to play second fiddle at the other end. The Essex lead is now just 35 runs.
It's been a good day so far for the Pakistan tourists at Wantage Road. They've bowled out Northamptonshire for 259, with Shadab Khan returning figures of 6-77. Adam Rossington top-scored for the county side with 90, an innings which featured two sixes and eight fours.
Remember you can listen to commentary on that match by clicking the appropriate promo link at the top of this page.
With Somerset going well against Lancashire, here's one of their former captains talking about the new challenge awaiting him as Australia's head coach.
New Australia head coach Justin Langer says respect on and off the field is "worth more than all the gold in the world".
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From Adrian Hearn: "42-year-old Marcus Trescothick hit 100 for Somerset against Lancashire 42-year-old Darren Stevens took 6-26 for Kent against Glamorgan Brilliant to see the veterans showing they can still do it! #bbccricket, external"
Golden oldies, the pair of them.
Nottinghamshire 302 v Hampshire 0-1 (2 overs)
Stuart Broad makes an instant breakthrough in his opening over as a sharp delivery leaps up on Jimmy Adams and clips his glove on the way through to wicketkeeper Tom Moores.
Great start for the England bowler and Nottinghamshire at Trent Bridge.
Somerset 276-3 (78.4 overs) v Lancashire
There is a moment 20-year-old George Bartlett won't forget - a boundary off Jordan Clark and he reaches a maiden Championship century from 189 balls.
He has hit a six and 12 fours in total, not bad for a player whose highest first-class score prior to this game was 39. Tom Abell has 30 at the other end and they have so far added 61 for the fourth wicket.
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Yorkshire 50 & 34-0 (6.4 overs) v Essex 142
When your team was bowled out for 50 earlier in the day, most openers might opt for a little circumspection second time around. But having been pressed into service as an opener, Jonny Bairstow makes an early statement of intent - he will do it his way.
The England wicketkeeper smashes a lofted four straight down the ground off Sam Cook and in the seam bowler's next over despatches him for a six and four over mid-off.
Another boundary follows off Jamie Porter and just like that, Bairstow is 26 not out - Yorkshire's highest score in the match. Can he keep it going?
Surrey 243-4 (82 overs) v Worcestershire
Mark Church
BBC Radio London commentator
This has been a very good effort from the captain. Watchful, compact and leading from the front, Burns has illustrated his international credentials once again.
A 125 run partnership with Ben Foakes who was caught behind off Ed Bernard for 72, has moved Surrey into a strong position on the first day.
Image source, Getty Images
Derbyshire 318 v Warwickshire 290-5 (84 overs)
Image source, Getty ImagesA single off Duanne Olivier carries Jonathan Trott to a 78-ball half-century. It's a welcome return to form by the former England batsman, who followed an unbeaten 111 against Durham MCCU with scores of 15, 4 and 4 in his three previous Championship innings. He and Matt Lamb have so far put on 81 and the Bears are well on their way to a first-innings lead.
Middlesex 230 v Sussex
Max Holden is left high and dry on 84 not out as Middlesex are finally all out against Sussex at Hove. Ollie Robinson bowls last man Tom Barber to finish with superb figures of 7-58. It's not a career-best, but he won't care about that - and neither will his team, who will now look to bat well and establish a healthy lead.
Nottinghamshire 302 (69.3 overs)
Liam Dawson wraps up Nottinghamshire's innings as Jake Ball attempts to send the spinner into the stratosphere but misses the ball and is bowled.
Hampshire will face 24 overs this evening, with the change in innings.
Yorkshire 50 & 3-0 (1 over) v Essex 142
Here's a turn-up. Yorkshire have sent Jonny Bairstow out to open with Adam Lyth in place of Harry Brook in their second innings.
He's done the job for England in limited-overs cricket, but given that he was out for seven in their first knock earlier today, this is a tough assignment. He faces three balls in Jamie Porter's over without scoring.
Surrey 225-4 (73 overs) v Worcestershire
Ben Foakes nibbles at a fuller ball from Ed Barnard and only manages to feather the ball behind to wicketkeeper Ben Cox.
Brings to an end Foakes and Burns' 125-run fourth-wicket partnership, which has helped Surrey consolidate their position on day one at the Oval.
Nottinghamshire 301-9 (69 overs) v Hampshire
Harry Gurney whips Kyle Abbott away for a pair of boundaries to take Nottinghamshire past 300 and bring up their third batting bonus point.
Gurney's partnership with Jake Ball has moved on 26 runs, are Hampshire continue to search for that final wicket and get themselves out in the middle batting as soon as possible.
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Earlier on, we asked you to nominate a top six to bat for England in the first Test against Pakistan later this month. Given Rory Burns' century against Worcestershire, maybe it's not a bad shout - but we're not sure about numbers 1, 3, 4 and 6 based on today's form. What do you think?
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Jonathan Trott is batting well for Warwickshire at Edgbaston the day after confirming he is to retire at the end of the season. He has made an unbeaten 44 in a total of 276-5, replying to Derbyshire's 318 all out.
Middlesex have reached 224-9 on day one against Sussex at Hove, where Max Holden is 78 not out, but Tim Murtagh is gone now, caught off George Garton for 26.
Kent are trying to stabilise their innings against Glamorgan at Sophia Gardens with Joe Denly and Zak Crawley together. The visitors are 47-3 in reply to Glamorgan's 94 all out.
Leicestershire have added 17 without loss since tea against Durham, moving on to 220-3 with Mark Cosgrove 23 not out and Ned Eckersley on five.