In the battle of the South Group leaders in Cardiff, Surrey have won the toss and will bat against an unchanged Glamorgan.Glamorgan's Dale Steyn, who has taken nine wickets in his last three matches, plays his final game for the club this season

Meanwhile, Surrey make one change from the side that beat Middlesex by 29 runs last Friday as Gary Wilson comes in for Jason Roy.

Glamorgan: Rudolph, Lloyd, Ingram, Donald, Cooke, Wagg, Meschede, Steyn, van der Gugten, Cosker, Hogan.

Surrey: Davies, Burns, Sangakkara, Foakes, Ansari, Bravo, Wilson, S Curran, T Curran, Batty, Rampaul.

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Worcestershire have won the toss at Old Trafford and chosen to field first. They make one change from the side that lost to Notts last Saturday, with Jack Shantry replacing Moeen Ali, who is on England duty.

Lancashire give a debut to Tom Moores, the son of former England coach Peter, following his arrival on loan from Notts.

Lancashire: Guptill, Petersen, Brown, Livingstone, Croft, Clark, Moores, Lilley, Parry, Edwards, Buck.

Worcestershire: Mitchell, Kohler-Cadmore, Clarke, Kervezee, D'Oliveira, Whiteley, Cox, Leach, Henry, Barnard, Shantry.

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The big news for Durham and England fans is that Ben Stokes will make his comeback this evening with the bat, following a knee injury that has kept him sidelined since mid-May.

The Jets have won the toss and will bowl first, with both sides in desperate need of a victory in the North group.

Durham: Stoneman (capt), Mustard, Muchall, Stokes, Richardson, Borthwick, Pringle, Jennings, Coughlin, Arshad, Rushworth.

Yorkshire: Lees (capt), Lyth, Williamson, Ballance, Leaning, Bresnan, Hodd, Rafiq, Patterson, Shaw, Carver.

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There's been afternoon showers at Grace Road but the news is that, all being well, we will start on time.

And the news from the middle is that Birmingham, who know that victory is likely to take them top of the North group, have won the toss and put the Foxes in.

Leicestershire: Pettini (capt), Cosgrove, K O'Brien, Akmal, Delport, Dexter, Hill (wkt), Wells, Raine, McKay, Naik.

Birmingham: Hain, Bell (capt), Porterfield, Ronchi (wkt), Clarke, Javid, Adair, Patel, Gordon, Hannon- Dalby.

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Middlesex's four-run win in a nine-over thrash against Somerset last night moved them above their opponents into fifth place in South Group - but they are just two points adrift of leaders Glamorgan, who head the table by one point from Surrey, Sussex and Gloucestershire.

In North Group, Northants, Birmingham Bears and Worcestershire all have nine points, with the Steelbacks - winners in 2013 -  on top by virtue of a superior run-rate. They are not in action tonight, though, so things may be about to change.

Even Kings and Queens love the T20 Blast - but how many of you know where Lesotho is?

Here's tonight's bill of fare:

18:30 - Durham v Yorkshire, Emirates Riverside

18.30 - Glamorgan v Surrey, SSE Swalec

18:30 - Lancashire v Worcestershire, Emirates Old Trafford

18:30 - Leicestershire v Warwickshire, Fischer County Ground

19:00 - Derbyshire v Nottinghamshire, 3aaa County Ground

19:00 - Essex v Hampshire, Essex County Ground

19:00 - Kent v Middlesex, Spitfire Ground, St Lawrence

The Universe Boss is gone, but the T20 Blast rolls on.

Yes, Chris Gayle may be history as far as this season's competition is concerned, but there are plenty of other batsman capable of providing big-hitting thrills.

Ross Taylor of Sussex and Glamorgan's Colin Ingram are jointly tied with Gayle at the top of the 'most sixes' list, with 13 each, but Worcestershire's Tom Kohler-Cadmore - the leading run-scorer in the competition - has only one fewer.

And tonight we have the mouthwatering prospect of England's Ben Stokes flexing his muscles for Durham.

Who's going to have the fans diving for cover in our seven games this evening? Stay with us for the next few hours and find out. Play in the first four starts at 18:30 BST.

Image source, Rex Features