Derbyshire will bowl first after winning the toss.

Derbyshire:  Godleman, Slater, Hughes, Madsen, Durston, Thakor, Elstone, Poynton, Palladino, Footitt, Cotton

Essex:  Lawrence, Browne, Westley, Bopara, Ryder, Ten Doeschate, Pettini, Foster, Winslade, Porter, Moore

Kent win the toss and are the only team to choose to bat today.

Glamorgan:  Kettleborough, Lawlor, Lloyd, Ingram, Cooke, Donald, Wallace, Wagg, Meschede, Salter, Hogan

Kent:  Bell-Drummond, Key, Denly, Northeast, Stevens, Dickson, Davies, Haggett, Coles, Riley, Hunn

Fresh from signing a new one-year deal with Durham, Paul Collingwood has won the toss and elected to bowl.

Nottinghamshire: Libby, B Taylor, Mullaney, Lumb, Wessels, Patel, Read, Hutton, Wood, Ball, Gurney

Durham:  Stoneman, Burnham, Borthwick, Collingwood, Richardson, Muchall, Pringle, McCarthy, Harrison, Rushworth, Onions

Despite Yorkshire losing several players to the England fold this summer, they're still on the verge of the title.

Why do you think the White Rose county has been so successful for the second season running? 

Is it the coach, the captain, their fast bowling riches?

Get in touch on Twitter using #bbccricket

In the big game down at the bottom of Division One Marcus Trescothick has called the toss correctly and Somerset will bowl first.

Somerset:  Trescothick, Abell, Cooper, Hildreth, Allenby, Trego, Ronchi, C Overton, Gregory, J Overton, Leach

Hampshire:  Carberry, Adams, Vince, Smith, Dawson, Ervine, Wheater, McLaren, Berg, Crane, Edwards

The news from the middle at Lord's is that Yorkshire have won the toss and elected to bowl first.

There's no Jonny Bairstow for the White Rose county, he's on England duty, so Andy Hodd takes the gloves.

For Middlesex, 21-year-old wicketkeeper-batsman Stevie Eskinazi makes his debut.

Middlesex: Robson, Stirling, Compton, Malan, Eskinazi, Dexter, Franklin, Simpson, Harris, Roland-Jones, Murtagh

Yorkshire: Lyth, Lees, Leaning, Gale, Ballance, Hodd, Bresnan, Middlebrook, Brooks, Patterson, Sidebottom

Image source, Getty Images

While they may only need six points from their final three games, Yorkshire coach Jason Gillespie has urged his side to stay focused.

Even if their minds are already on the beach, it'll take something of a miracle to miss out from this point...but you can read more about what Mr Gillespie had to say here.

As well as the game at the 'home of cricket' there's also a huge clash at Taunton where relegation rivals Somerset take on Hampshire.

Just five points separate Hampshire in eighth and a relegation spot and their West Country opponents who sit in seventh.

Here's today's full line-up (all games start at 10:30 BST):

Division One:

Middlesex v Yorkshire - Lord's 

Nottinghamshire v Durham - Trent Bridge

Somerset v Hampshire - Taunton

Division Two:

Derbyshire v Essex - Derby

Glamorgan v Kent - Cardiff

Image source, Getty Images

It's been quite a season for the reigning County Champions Yorkshire.

Unbeaten, with nine wins and four draws, Andrew Gale's side need just six points to win back to back titles.

Today, they start their quest at Lord's against Middlesex.

Welcome to our live text coverage of the next round of County Championship fixtures.