Middlesex, Yorkshire and Somerset can all win title
Warwickshire, Lancashire and Hampshire in relegation danger
Middlesex 208-5 v Yorkshire - Gubbins 120*
Somerset collapse from 322-4 to 322-9 v Notts
Somerset 312-4 v Notts
Peter Trego and Lewis Gregory are leading a bit of a charmed life for Somerset. Both batsmen have been dropped in the last couple of overs.
Batting suddenly looks a lot more difficult for the hosts at Taunton.
Somerset 312-4 v Notts
Erm - ouch. No wonder James Hildreth was hobbling.
Middlesex 208-5 v Yorkshire
He's faced 235 deliveries and been there since ball one this morning, but Nick Gubbins looks as fresh as a daisy at Lord's.
The young opener is now unbeaten on 120. If he's there at stumps it will surely have to go down as one of the finest innings of the season.
Yorkshire are taking the new ball.
Somerset 308-4 v Notts
Both of Somerset's batting heroes are now back in the pavilion.
James Hildreth, who batted with an ankle injury and could hardly run, nicks Brett Hutton behind for 135.
His huge stand with Chris Rogers has put Somerset in a dominant position, but there is still work to do to get maximum batting bonus points and a total which is likely to win them the game.
Somerset 302-3 v Notts
It's Somerset skipper Chris Rogers. The Australian is caught by Steven Mullaney at slip to give Jake Ball his third wicket.
A fantastic knock from the 39-year-old though which lasted 204 balls and contained 18 fours.
Peter Trego is the new man in with Somerset needing 98 off 25 overs to secure maximum batting bonus points.
Hampshire 323-5 v Durham
Hampshire are doing everything they can to try and ensure their Division One survival.
Sean Ervine is the fourth batsman to pass fifty in the innings - his fifth of the season.
But next ball the all-rounder is caught at slip by Paul Collingwood off Ryan Pringle.
There is also a big wicket at Taunton to tell you about...
Middlesex 200-5 v Yorkshire
There are nice, round figures everywhere! Middlesex bring up their 200 and first batting bonus point.
Nick Gubbins now looks entrenched. The opener is 114 not out off 215 balls.
And he's been there for exactly 300 minutes! This is getting spooky now.
Somerset 300-2 v Notts
James Hildreth and Chris Rogers continue on their merry way at Taunton as they bring up a third-wicket partnership record against Notts.
Their 267 surpasses Richard Harden and Chris Tavare's 265 in 1992 at the same ground.
Hampshire 301-4 v Durham
Talking of batting bonus points Hampshire now have three to their name. Sean Ervine, who is in the form of his life with the bat is up to 44 and the hosts are in the driving seat at the Ageas Bowl.
Tight at the top, tight at the bottom, good this county cricket lark int it?
Warwickshire 203-8 v Lancashire
Every point counts in this relegation fight - and Warwickshire finally have one to their name.
Jeetan Patel smacks Luke Procter to the boundary three times in an over to take Warwickshire past 200.
Leicestershire 96 v Glamorgan 152-6
BBC Wales' Nick Webb at Grace Road:
"A remarkable game continues at helter-skelter rate at Grace Road with Glamorgan 56 ahead by tea, but with only four wickets left.
"Teenagers Aneurin Donald and Kiran Carlson put on 61 for the fourth wicket inside nine overs, only for Neil Dexter to wobble the ball around and claim three quick wickets with his medium-pace.
"Earlier Timm van der Gugten claimed county best figures of five for 52, as Leicestershire were bundled out before lunch.
"Carlson is still there on the game's top score of 44, but Glamorgan need a lead of at least 100 to take much advantage out of the day."
Warwickshire 190-8 v Lancashire
It's not getting any better for Warwickshire. Keith Barker is bowled by Jordan Clark for a duck, who now has figures of 3-20.
Can the Bears scrape another 10 runs to get a batting bonus point?
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Phil Dantes: James Hildreth - heroic. There's no other word. Someone get the cider.
Warwickshire 187-7 v Lancashire
Warwickshire's stuttering innings continues at Edgbaston. Sam Hain is the latest to go, lbw to Luke Procter.
The bad news from the Ageas Bowl for Bears fans is that Hampshire look like making a big first-innings total against Durham.
Keith Barker and Jeetan Patel are at the crease in Birmingham.
Middlesex 179-5 v Yorkshire
And it's gone to Nick Gubbins! The Middlesex opener brings it up in style, swatting Ryan Sidebottom over the square leg boundary for six.
It's surely one of the toughest centuries he will ever make. Huge pressure, fine bowling attack, muggy, overcast conditions at Lord's.
His job is only half done though - Middlesex are still in a vulnerable position.
Somerset 260-2 v Notts
What an innings by Somerset batsman James Hildreth. After being struck on the ankle early in his innings, the 32-year-old has nurdled his way to a superb century.
It came off 199 balls with 11 fours and one maximum.
Meanwhile, there's another hundred to tell you about at Lord's...
Middlesex 169-5 v Yorkshire
HUGE appeal from Ryan Sidebottom in his first over after tea.
The wiry-haired seamer thinks he has Nick Gubbins caught down the leg-side, but it's given not out.
Hmm, snicko suggests there may have been a tiny nick on that one. You can see why the umpire turned it down though - it really was the faintest of edges.
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Thomas Broadley: Middlesex V Yorkshire will be a cracker later on in the game. Somerset will win so both teams will have to win the game.
Hampshire 275-4 v Durham
Oh, another twist at the Ageas Bowl. Hampshire skipper James Vince is run out by Ben Stokes for 92.
That's a massive blow to Hampshire's survival hopes.
Warwickshire 178-6 v Lancashire
21-year-old Sam Hain is fighting a bit of a lone battle for Warwickshire at Edgbaston.
The youngster reaches only his second half-century of the summer as the Bears creep towards their first batting bonus point.
But Warwickshire bat deep. And it's a lower order which has got them out of trouble plenty of times in the past!