Middlesex lose an early wicket in Cardiff as Sam Robson edges Timm van der Gugten to second slip and is caught by Sam Northeast for six.

But that is the only damage in a six-over mini-session for the visitors after Ryan Higgins' 5-59 helped finally bowl out Glamorgan for 383.

They added 49 to their overnight score, with Chris Cooke falling three runs short of 50 when he was lbw to Dane Paterson.

Glamorgan have Australian spinner Matthew Kuhnemann in their team for this game and it will be interesting to see him in action later.

Durham still very much on top, but they will cross with losing two wickets in the five overs faced before lunch.

Ben McKinney and Emilio Gay went in the space of three balls from Matt Henry who's taken his tally against Durham to an incredible 18 wickets in two games.

He could yet have a big say in the size of the target Somerset are ultimately set.

Mitch Killeen was the star of the show this morning as Somerset subsided from 63-3 to 172 all out.

The 20-year-old bagged five wickets on his Championship debut with a stunning performance that he'll rightly remember forever.

It might yet get even better.

Total dominance of this first session from Sussex who have taken a hold of his contest through John Simpson (70) and Fynn Hudson-Prentice (62) in complete control.

Resuming on 110-5 Sussex their 145-run partnership has more than doubled the total with few alarms and they go in for a feed with a 74 run lead.

It has been a slog for the Hampshire bowlers with John Turner's opening day 3-42 still standing as the best in show and more will be needed after the break if Sussex are not to get too far off the leash to be reined back.

A couple of wickets late in the session are unlikely to spread much joy in the Kent dressing room at the County Ground.

Derbyshire added 131 during the morning, with Australian Caleb Jewell still there on 210 not out - just 18 short of a career-best.

He put on 176 with Wayne Madsen, who fell to Jack leaning for exactly 100, with Matt Parkinson bowling Brooke Guest for three shortly afterwards.

A declaration at this stage is perhaps unlikely, but Madsen will now be 'running the numbers' through his mind ahead of the afternoon.

Image source, Rex

Surrey reach 200 just before the interval at The Oval as Sam Curran pushes a single off Noah Thain to mid-wicket.

It has been an enthralling morning's action with Essex fighting back well, picking up four wickets after Surrey resumed on 94-3.

Three or them were taken by Kasun Rajitha, who has figures of 4-54, but the champions have been revived by an unbroken stand of 59 between Curran (55 not out) and Jordan Clark (34).

If these two can stay together for a decent period after lunch, Surrey could yet achieve a healthy first-innings lead.

Notts will be the happier of the two sides as they leave the field after the first session having taken five wickets at a cost of 109 runs.

Dawid Malan's rapid fire 64 may split opinion given it was more of a T20 innings than County Championship, but in matching Joe Clarke's 64 from Notts' first innings that alone should ensure that the finger of blame points elsewhere.

Notts have bowled well with Jack White, Harry Duke and George Hill all getting excellent deliveries (the last two were virtually unplayable).

Had the rest batted around Malan with greater purpose Yorks could be in a far better position.

Jordan Clark stands tall and flays Noah Thain through the covers for four as he and Sam Curran achieve a half-century stand from just 48 balls.

Clarks has 31 not out, made at a run a ball. He can be a dangerous customer if he's in the mood.

Relief for Durham skipper Alex Lees.

He avoids a king pair (having got a first baller in the first innings) in the opening over from Matt Henry.

After five dots he steers Henry down past the slips to the fence to get going in the match with a four.

Lee's partner Ben McKinney then plays out a maiden from Josh Davey.

Jonathan Doidge
BBC Radio Leeds cricket commentator

That one looks like it has kept a little bit low and the middle stump has been knocked back.

The bail has disappeared some 10 to 12 yards behind the stumps.

Yorkshire in major trouble here.

for Sam Curranpublished at 12:45 British Summer Time 24 May

12:45 BST 24 May

Surrey 182-7 v Essex 217

Just a few minutes after his brother Ben survives a review, batting for Zimbabwe against England at Trent Bridge, Sam Curran reaches 50 off 64 balls with a single from the bowling of Noah Thain.

It's a been a high-class innings, in which he has been very severe on anything short of a length - his first of the season in the County Championship.

Martin Emmerson
BBC Radio Newcastle

Mitchell Killeen has had a County Championship debut to remember, taking 5-36 in 10 overs. And all while his dad, former Durham fast bowler Neil, was watching in the stands.

Neil served Durham for more than a decade and is now part of England's bowling set-up.

Somerset were all out in 38.4 overs for 172 and that included a final wicket partnership of 43 from Matt Henry and Migael Pretorius, who took the word agricultural to new levels.

To say they tried to 'howk' every ball into next week is not an exaggeration. Howk is a North East phrase similar to giving it some welly.

There were plenty of air shots - and a few boundaries - to brighten up an otherwise poor morning for the visitors who lost seven wickets for 99 runs.

It is cloudy and muggy in CLS. Good conditions for the bowlers. It will be interesting to see how Durham get on in their second innings. I bet Henry can't wait to get the ball in his hands.

for Caleb Jewellpublished at 12:40 British Summer Time 24 May

12:40 BST 24 May

Derbys 468-2 v Kent

Having hit Matt Parkinson for six in his previous over, Caleb Jewell settles for pushing a single as he reaches 200 off 324 balls.

What a great innings it's been - and he will now presumably have hit sights set on his career-best score of 227 for Tasmania against Western Australia in February last year.

up for Worcestershirepublished at 12:40 British Summer Time 24 May

12:40 BST 24 May

Worcestershire 101-5 v Warwickshire 227

Worcestershire's punctured first innings brings up its three figures but, with half the team out, even getting close to the Bears total seems optimistic.

Particularly in the face of the fast-medium magic of Warwickshire's Chrises - Woakes and Rushworth - who've been superb on a much better day for bowling.

The Pears will take some comfort that they can't bowl forever. They're off now but will come back recharged after lunch no doubt.

A fourth batting point in the bag for Northants as Lewis McManus and Calvin Harrison add to Gloucestershire's pain.

Remember Northants were 71-4 yesterday.

200 for Sussexpublished at 12:35 British Summer Time 24 May

12:35 BST 24 May

Hants 154 v Sussex 200-5

John Simpson has moved to his half century and Fynn Hudson-Prentice now has his as Sussex continue to pile the pressure on Hampshire.

There was a half appeal against Simpson for a short leg catch after Liam Dawson gets one to turn but there is no doubt it comes off the pad.

This is becoming increasingly frustrating for the hosts with the lead already 46.