The unbeaten Yorkshire Vikings have won the toss at Chester-le-Street and have elected to bowl first under the lights.

The Tykes are unchanged from last week's victory over Nottinghamshire. Durham are also unchanged and will be looking to Phil Mustard, their highest run scorer against Yorkshire, to lead them to victory.

Yorkshire: Gale, Hodd, Lees, Bairstow, Maxwell, Rashid, Bresnan, Plunkett, Pyrah, Leaning, Fisher, Rhodes

Durham: Stoneman, Macleod, Muchall, Collingwood, Mustard, Hastings, Pringle, Arshad, Jennings, Borthwick, Coughlin

Derbyshire win the toss and opt to bowl first against last year's beaten finalists Lancashire, so home fans will have to wait for a view of surely the most experienced opening pair in the competition - Hashim Amla and debutant Tillakaratne Dilshan.

The exciting Liam Livingstone will start things off for Lancashire alongside Ashwell Prince, who made the small matter of 230 as they beat tonight's opponents in a Championship game earlier this week.

Derbyshire: Dilshan, Amla, Durston, C Hughes, Elstone, Godleman, THakor, Poynton, White, Palladino, Cotton.

Lancashire: Livingstone, Prince, Brown, Croft (capt), Horton, Faulkner, Davies, Clark, Lilley, Edwards, Parry.

That is absolutely huge from Tom Wells as he smashes Jack Shantry out of the ground for six.

12 runs come from the penultimate over.

Can Leicestershire get to 150?

Sam Northeast welcomes Zafar Ansari into the Surrey attack by charging down the pitch and slamming his first ball over his head for six.

The right-hander drives Ansari beautifully through the covers for four, before sending another one into the sightscreen for another maximum as Ansari's first over costs him 20!

Wayne Parnell has his first wicket for Glamorgan.

James Vince begins with an aerial drive through the off-side to the fence, but Parnell slides one across him two balls later and Vince edges to Colin Ingram at slip.

An excellent start for the hosts. Jimmy Adams is the new man.

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Sam Northeast slogs Gareth Batty for two successive sixes, one over the leg-side and one high over the long-on boundary, to keep Kent ticking over.

The normally economical Batty sees his second over fly away for 18 as Northeast flays the spinner to bring up his seventh T20 half-century.

Clear skies at Wantage Road where hosts Northants wins the toss and elect to bat first against holders Birmingham Bears.

The Steelbacks are looking for their first win, having only played one game so far. The Bears, meanwhile, have won one and lost one, most recently overcoming rivals Worcestershire at Edgbaston in a low-scoring encounter.

Northants welcome back star man Shahid Afridi for his home debut, while the visitors are without their overseas signing, Brendon McCullum, who is otherwise engaged playing for New Zealand against England.

Northants: Wakely (capt), Levi, Willey, Cobb, Crook, Afridi, Rossington, Keogh, Kleinveldt, White, Azharullah.

Birmingham Bears: Chopra (capt), Porterfield, Lewis, Ambrose, Clarke, Evans, Javid, Patel, Gordon, Hannon-Dalby, Rankin.

Leicestershire's stop-start innings continues as Grant Elliott chips Ed Barnard straight to short third man.

The Foxes keep losing wickets as crucial times which means they are struggling to build any momentum.

You'd have to think they would be delighted with 150 from here.

Gareth Batty has come into the attack to try and increase the pressure on Kent. After an early flurry of runs - and the subsequent rush of wickets - Fabian Cowdrey and Sam Northeast have played cautiously.

But Cowdrey has had enough and swings Batty away for six. The greasy outfield is making it awkward for the fielders and the two batsman are quick between the wickets to keep the scoring rate increasing.

Just as Leicestershire are starting to build some momentum at the back end of their innings, they lose the dangerous Niall O'Brien.

The wicket-keeper smashes Daryl Mitchell to the deep square leg boundary where Richard Oliver holds onto the catch.

New Zealander Grant Elliott is likely to hold the key to how many the Foxes score here - he's 25 not out.

Worcestershire captain Daryl Mitchell decides it is time to have a bowl and it proves to be a very smart choice.

He concedes just two runs from the 14th over as Leicestershire bring up their 100.

It's difficult to know how many will be a par score here, the pitch is looking quite slow, but this is T20 cricket.

A good over from Tom Curran, who mixed up his lengths and speeds nicely to trick Joe Denly and slow down Kent's frenetic scoring rate.

Moises Henriques has his first bowl for Surrey. You'd suspect windy Beckenham might be a big change from the heat of Hyderabad but it hasn't bothered the all-rounder.

He claims his first wicket for Surrey as Sam Billings miscues a flat-batted shots and hits it high into the air. Despite the wind, Kumar Sangakkara takes a good catch to leave Kent three down.

The weather is set fair at the Swalec stadium in Cardiff where Glamorgan have won the toss and elected to bowl first against Hampshire.

Both sides are looking to bounce back after losses last week, with Glamorgan going down to a Ravi Bopara-inspired Essex and Hampshire losing out to Kent.

The hosts welcome South African all-rounder Wayne Parnell into their side after his stint with Delhi Daredevils in the IPL, while Hampshire are unchanged, with Yasir Arafat set to make his 200th T20 appearance.

Glamorgan: Rudolph (capt), Wright, Ingram, Cooke, Wallace, Meschede, Wagg, Parnell, Salter, Cosker, Hogan.

Hampshire: Vince (capt), Carberry, Adams, Shah, Ervine, Smith, Wheater, Wood, Arafat, Briggs, Edwards.

Leicestershire are starting to set themselves a platform following that flurry of wickets after the powerplay.

Niall O'Brien and Grant Elliott are just ticking over at the moment, but it can't be long until O'Brien opens his shoulders.

The sun is now out at New Road as well.......it's not every day you can say that!

Kent have clearly decided that the best way to get over Thursday's defeat at Lord's is to thrash everything to the boundary. It was working rather well for Joe Denly, who crunched Matt Dunn for a straight six to bring up Kent's 50.

The opener has, however departed, hitting the ball straight to James Burke on the leg-side boundary. A disappointing way to get out. Sam Billings is the next man in.

Azhar Mahmood's first two overs have gone for 29. The 40-year-old looks a little rusty - maybe he is still jetlagged from the flight over from India, where he was playing in the IPL?

Sam Northeast has been taking advantage, belting the all-rounder over mid-wicket for a six which, to add to Mahmood's woes, was a no-ball. The resulting free hit goes sailing for four. Just the 20 runs off the over then..

Leicestershire have reached the halfway point of their innings at New Road and will probably be slightly disappointed having lost four wickets.

One more wicket for Worcestershire and they will be well on top, but Grant Elliott and Niall O'Brien can take the game away from you quickly.

How is this one going to go?

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We are counting down to the start of Northants v Birmingham Bears and Glamorgan v Hampshire at 18:30 BST....back for Northants after a trip home to play for Pakistan is all-rounder Shahid Afridi. His T20 Blast debut for the county two weeks ago was a disappointment when the Steelbacks were beaten by 41 runs by Durham via the Duckworth-Lewis method after he took 2-28 in his four overs of leg-spin.

As well as entertaining the crowds, Afridi has also set himself the task of fostering links between the club and the South Asian community in the area as he explained in an exclusive interview with BBC Sport, which you can read here.

A quiet over for Kent as Sam Northeast gets his eye in. Matt Dunn just strays slightly off-line with his final ball and it is clipped away by Joe Denly for another boundary.

Azhar Mahmood returns but the wet outfield is giving the fielders a nightmare. One delivery skids through the fielder's arms, before Northeast slams Mahmood through wicket for another boundary.

Leicestershire are collapsing here after such a fine start and it's the skipper Mark Cosgrove who has gone.

It was a poor shot as well as he drilled Sachithra Senanayake straight to cover.

The Foxes have Niall O'Brien and Grant Elliott at the crease though and they are more than capable of changing things.