Division One leaders Somerset all out for 326 against Notts after 50s for Davies and Bess
Tom Westley makes 50 in Essex's 122-3 after they dismissed Yorkshire for 208
Surrey six wickets down at stumps against Kent at the Oval
Yates makes maiden 50 for Warwickshire after Hampshire post 539 on day two
Both teams bowled out on crazy day one of Worcs v Derbyshire at Kidderminster in Division Two
Bavuma makes 100 for Northants against Lancashire
That's it for day one in seven of our matches, as well as the second day at Southampton.
It's been action-packed with wickets tumbling at almost every ground. It seems like all of the teams want to get done and dusted within three days.
Well, we'll be back at 10:45 BST tomorrow to see how the next day goes.
Thanks for reading.
Gloucestershire 59-2 v Middlesex 172
Chris Dent survives a big lbw appeal to Toby Roland-Jones on the final ball so Gloucestershire battle to the close. There was some miserly Middlesex bowling there.
The home side won't be too disappointed as having been shot out for just 172 they've managed to restrict their opponents in this final session so Gloucestershire haven't been able to score quickly.
A long way to go in this match yet.
Derbyshire 108 & 19-0 v Worcestershire 113
An utterly bonkers opening day is done then.
Both sides bowled out and still time for Derbyshire to bat again and reach the close on 19-0, meaning they've overhauled their deficit and now lead by 14 runs.
Surrey 244-6 v Kent
Bad light does for day one's play at The Oval then.
England wicketkeeper Ben Foakes will resume on 57 for Surrey in the morning. Dean Elgar's half-century and 43 from Sam Curran have helped the home side into a decent position.
Some early wickets for Kent tomorrow though and it could well be them on top.
Warwickshire 198-3 v Hampshire 539
That's a pretty good effort from Warwickshire, and especially Rob Yates, under the weight of some pretty heavy scoreboard pressure and yet Hampshire will still fancy their chances of making the Bears follow on.
Jeetan Patel's side will resume tomorrow still 341 behind with Sam Hain unbeaten on 68 and Adam Hose six not out.
Yates' 91 was the highlight of the day for the visitors but the teenage will doubtless have a tinge of regret at missing out on three figures.
Leicestershire 124-4 v Durham 117
That's it for day one at Grace Road where Leicestershire could scarcely have been more dominant. They skittled Durham out for 117 as Chris Wright took 5-30, then skipper Paul Horton scored 50 to lay the basis for a solid response.
They already lead by seven runs and have six wickets in hand.
Surrey 244-6 v Kent
The gloom has intervened at The Oval with 9.2 overs still scheduled to be bowled. If they don't return to the field tonight, Ben Foakes will return tomorrow 57 not out with Rikki Clarke on five.
Surrey 233-6 v Kent
That's an important half-century for the England wicketkeeper and it might just help Surrey post something competitive in their first innings.
Foakes gets there by sending Grant Stewart through backward point for four with the outer half of the bat.
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Somerset 326 v Nottinghamshire
Luke Fletcher has Jamie Overton caught at slip for 34 and a few balls later Ravi Ashwin traps Jack Leach lbw for one to end the Somerset innings and the day's play.
Nottinghamshire might be a tad disappointed having had Somerset 145-6 before a century stand between Dom Bess (51) and Steven Davies (74).
But once that pair fell in quick succession, the innings was over fairly quickly. Overton's dash at the end could prove to be vital in the final analysis though.
Surrey 224-6 v Kent
That's three wickets for Grant Stewart as he angles one in to Jamie Smith, who is struck on the shin and barely glances at the umpire before turning and walking off.
Rikki Clarke has joined Ben Foakes, who is 47 not out.
Worcs 113 v Derbyshire 108
What a crazy opening day at Kidderminster with 20 wickets already and still time on day one for more.
The ECB pitch inspectors will, it's probably safe to assume, be putting Chester Road into their 'sat-navs' over the next day or so.
The home side actually did well to eek out a first-innings lead of five after they found themselves 77-8 but Dillon Pennington was their highest scorer with 18 while Luis Reece claimed 4-30.
Essex 122-3 v Yorkshire 208
Essex's day at Chelmsford as they reach stumps just 86 runs adrift of Yorkshire's total and with seven wickets still in hand. They also have Tom Westley there well set on 52.
Yorkshire battled there way past 200 with the bat thanks to contributions further down and a top score of 46 from Harry Brook, but as is often the case Essex's tormentor in chief was spinner Simon Harmer who took 5-76.
Surely this match isn't going to a fourth day.
Northants 334-5 v Lancashire (close, day one)
That's stumps at Wantage Road - an excellent opening day for Northamptonshire with skipper Adam Rossington finishing 76 not out.
His century stand with Temba Bavuma (103) is what has put the home side into this position after the foundations were laid by 77 from opener Ricardo Vasconcelos.
Lancashire have some real work to do in the morning.
Warwickshire 181-3 v Hampshire 539
No maiden century for Rob Yates as he hands Felix Organ his first County Championship wicket.
Yates steps down the pitch and tries something expansive against the spinner but it flies off the inside portion of the bat and Gareth Berg takes the catch at short midwicket.
The third-wicket partnership with Sam Hain was worth 142.
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Essex 122-3 v Yorkshire 208
Tom Westley becomes the first man to reach a half-century in this match, edging his way there with a boundary - his eighth so far.
It's taken him 101 balls. There are now three overs for him to survive to the close. If he does, Essex will have had a very good opening day.
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Warwickshire 168-2 v Hampshire 539
Warwickshire have big hopes for both Rob Yates and Sam Hain and the two batsman are showing why in the evening session at the Ageas Bowl.
Yates is just 16 runs away from a maiden first-class hundred and Hain has moved on to 60 not out.
It's been a good couple of hours from the visitors but they are still 366 behind with plenty more to do to avoid the follow-on.
Meanwhile Felix Organ - what a great name - is into the attack with his off-breaks on his Hampshire debut.
Somerset 292-8 v Nottinghamshire
That's four wickets for Luke Wood!
The left-arm seamer follows up the dismissal of Dom Bess for 51 by trapping Steven Davies lbw for 74 and going a long way to ending the Somerset first innings before the day is out.
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Surrey 191-5 v Kent
That's one big shot too many for Sam Curran, who attempts to fetch a short ball from Matt Milnes from outside off stump for a hook.
He gets a top edge and Heino Kuhn takes the catch at midwicket.
Jamie Smith comes to the crease to join Ben Foakes.
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Middlesex 172 v Gloucestershire
Well it's no better from bottom-of-the-table Middlesex as they fail to register a batting bonus point against Gloucestershire. That being said, they're playing a Merchant Taylor's School so who knows whether this is simply an out-ground wicket that is difficult to score runs on.
Four Middlesex batsmen did make it into the 20s though...
Essex 101-3 v Yorkshire 208
A poor stroke from Dan Lawrence really and he's paid the price. A very poor ball from Duanne Olivier, a long-hop down the legside, but it does the trick.
Lawrence clips it straight to Keshav Maharaj at short midwicket and he's gone for 15.