Mark Stoneman makes 165 on Surrey debut
New Yorkshire captain Gary Ballance out for 120
Yorkshire's Ben Coad takes 5-18 to leave Hants 58-5
Northants skittle Glamorgan for 101
Stuart Broad takes 3-45 for Notts
Lancs' Haseeb Hameed out for 47
Yorkshire 132-6 v Hampshire
And another! Yorkshire reeling at home - not a sight you would have envisaged last season.
It's a first wicket for Kyle Abbott on his return to Hampshire, as he dismisses Andrew Hodd courtesy of a catch from fellow South African Rilee Rossouw.
Kent 134-3 v Gloucestershire
Adam Whitty
BBC Radio Kent
Just when you think Kent are really getting ahead, Gloucestershire find a way of pegging them back.
Joe Denly looked in great form, and looked set for a first day hundred after scoring his fifty quickly after lunch, but Liam Norwell, who has bowled beautifully on day one, sent him back to the pavillion for 62.
We're back to honours even, you would feel.
Yorkshire 132-5 v Hampshire
Fidel Edwards is bowling with pace and plenty of aggression at Headingley and Tim Bresnan will be the first to tell you so as he returns to the dressing room.
The Yorkshire all-rounder had his stumps smashed by a searing yorker and Hampshire well and truly have their tails up.
Leicestershire 135-7 v Nottinghamshire
Stuart Broad is enjoying himself at Grace Road, removing Leicestershire skipper Mark Cosgrove for 57, via the gloves of wicketkeeper Chris Read, who now definitely has 1,000 first-class catches after some confusion earlier.
Notts into the Foxes' tail now.
Image source, Rex FeaturesEssex v Lancashire 136-4
Lancashire captain Steven Croft falls just short of a first half-century of the season, leaving the middle order open for Essex.
However, the away side will be hopeful that new signing Dane Vilas can hold the fort with 42-year-old veteran Shivnarine Chanderpaul, who stands at the other end after joining as a Kolpak for the season.
Yorkshire 125-4 v Hampshire
Hampshire making inroads at Headingley after lunch. Jack Leaning the man to go, pinned lbw by the medium-pace of Gareth Berg.
Tom Leaning (see 14:12 entry) I'm reserving judgement for the time-being... That's two sets of mockers in 30 minutes.
Northants 0-0 v Glamorgan 101
So, Glamorgan's troubles with the bat have given England batsman Ben Duckett an early chance to impress, as he comes out to open the batting with Rob Newton.
He'll be eager to show his talent after a difficult time of it against Sri Lanka and Bangladesh.
Who will shine in 2017? #bbccricket
Michael Laverton: Keaton Jennings could have another big season if he can get in England team as well
Tom Leaning: This season seems to be a make or break one for Jack Leaning (no relation). How do you both predict his season will go?
Well, Leaning is unbeaten on seven for Yorkshire at the moment Tom. He's clearly got talent - just needs to push on, get more big scores and move that first-class average way north from it's current 32 and change.
Surrey 155-1 v Warwickshire
Warwickshire finally have a breakthrough! And it's the trusty left-arm swing of Keith Barker that's done the trick, seeing Rory Burns caught behind.
Fellow debutant Scott Borthwick joins former Durham colleague Mark Stoneman in the middle.
Northants v Glamorgan 101
Glamorgan's sorry first innings has come to and end.
Aneurin Donald's 34 and some late swinging from Marchant de Lange (18) saw them into three figures, but they will be bitterly disappointed with their efforts.
Meanwhile, against a strong Nottinghamshire bowling line up its only Leicestershire captain Mark Cosgrove showing much resistance for , unbeaten on 50 after Ned Eckersley was trapped lbw by Stuart Broad.
Yorkshire 110-3 v Hampshire
Australian international Peter Handscomb is bowled by West Indian quick Fidel Edwards, for his second wicket of the day.
Jack Leaning the new man to join captain Gary Ballance.
Surrey 152-0 v Warwickshire
I don't wish to keep on reminding Ian Bell of his decision earlier this morning, but it seems I can conclusively say it was not the correct one.
Mark Stoneman and Rory Burns are continuing to make hay while the sun shines, touching gloves to celebrate their 150 partnership. The home crowd must be enjoying themselves in south London.
Image source, Getty ImagesEssex v Lancashire 126-3
This is how much the Haseeb Hameed wicket meant to Jamie Porter.
Pumped up is the big Essex paceman.
Image source, Rex FeaturesTweet us using #bbccricket
Milicica: Exceptional mockers on the first day of the season
Essex v Lancashire 118-3
Commentator's curse.
Straight after lunch and in front of Alastair Cook and James Anderson, England's bright young thing Haseeb Hameed has his stumps rearranged by Jamie Porter.
His innings of 103 balls, and six fours comes to an end.
Who will shine in 2017?
Surrey Pigeon: Mark Stoneman for the county game, Burns and Hameed for England white ball and test cricket
Thanks Gary.
It is certainly shaping up to be a eventful second session of the season - and in bright sunshine. We shouldn't be surprised by now, but Haseeb Hameed continues to impress. He's just three runs from a first fifty of the season.
Elsewhere in Division One there are four of the best batsman on show at The Oval and Headingley.
Let's see what's in store, shall we?
I'm going to now hand over to the only man I know from the Isle of Wight, Felix Keith, to take you through the afternoon session.
Can Warwickshire finally get a breakthrough? How many will young Haseeb Hameed get? How high will Fidel Edwards leap if he gets another wicket?
Let's find out...
Who will shine in 2017?
Thanks for all your interaction so far - who wants to work on a day like this anyway?!
I'm asking which one player you think will be a star this season? Mark Stoneman, Rory Burns and Haseeb Hameed have made early cases to nudge their way onto the list.
Get in touch using #bbccricket on Twitter.
Northants v Glamorgan 84-8
Nick Webb
BBC Radio Wales
Northants' seamers completely dominated the opening session of the season, bowling accurate lines to reap rewards after Glamorgan decided to bat.
Nathan Buck, a new signing from Lancashire, made the most of his colleagues' early incursions with three quick wickets in the middle order.
Rory Kleinveldt took the first two and returned to dismiss Craig Meschede, who had added 41 with Aneurin Donald for the 7th wicket.
Donald counter-attacked briefly with 34 before falling tamely to Steven Crook, caught behind as he flashed at a wide one. The Welsh side will soon be out in the field.