10:15pm - Here are all of the results from a thrilling night of Friends Life t20 action:
Leicestershire Foxes beat Durham Dynamos by 11 runs at Grace Road
Yorkshire Vikings and Lancashire Lightning played out a tie at Headingley.
Notts Outlaws defeated Derbyshire Falcons by six wickets at Derby.
Somerset claimed a four-wicket victory over Gloucestershire Gladiators at Taunton.
Northants Steelbacks defeated Warwickshire Bears by 27 runs at Wantage Road.
Surrey beat Middlesex Panthers by 15 runs at the Kia Oval.
Essex Eagles triumphed by 47 runs over Kent Spitfires at Canterbury.
Hampshire Royals secured a five-wicket win over Sussex Sharks at the BrightonandHoveJobs.com County Ground
10:01pm - RESULT! Hampshire Royals (148/5) beat Sussex Sharks (145/6) by five wickets at the BrightonandHoveJobs.com County Ground - Well, Sussex let that slip pretty quickly! McKenzie struck the first ball of the final over, bowled by Chris Jordan, for four and the wheels then came off for the Sharks as four overthrows turned two into six from the next delivery. McKenzie subsequently collected another boundary to wrap up an away win with three balls unused.
9:56pm - A tight over from Chris Liddle leaves Hampshire requiring 12 off the last.
9:49pm - McKenzie has 50 for Hampshire, who need 19 from 12 in the only match still in progress.
9:46pm - RESULT! Essex Eagles (164/6) beat Kent Spitfires (117 all out) by 47 runs at Canterbury - Essex romp home in the end, Topley and Graham Napier each finishing with three cheap wickets.
9:39pm - Consecutive fours from McKenzie steady Hampshire, but Kent now require a minor miracle.
9:36pm - RESULT! Notts Outlaws (116/4) beat Derbyshire Falcons (115/9) by six wickets at Derby - Derbyshire were always up against it after posting such a modest score. It was all rather easy for Notts, who retain their unbeaten record while inflicting a first loss on their arch rivals. Samit Patel hit the winning runs after claiming 3-16 with the ball.
9:32pm - Chris Nash traps Dawson lbw for a duck. Could Sussex still win this one? Hampshire need 47 off 39 with five wickets intact.
9:30pm - Bopara strikes again, claiming the wicket of Matt Coles to strengthen Essex's hold on proceedings at Canterbury.
Hampshire have lost Sean Ervine to Will Beer, which means Liam Dawson joins Neil McKenzie. The South African has 33.
9:24pm - Michael Lumb is out one shy of 50, yet that is highly unlikely to prevent Notts from easing to victory at Derby.
Kent, meanwhile, are 96 for five and need 69 from seven overs - a pretty tough ask.
9:20pm - RESULTS! Northants Steelbacks (161/2) beat Warwickshire Bears (134/8) by 27 runs at Wantage Road and Surrey (147/9) beat Middlesex Panthers (132/8) by 15 runs at the Kia Oval - Both Warwickshire and Middlesex are unable to overhaul their opponents’ scores, the latter on a pitch that offered significant assistance to spinners throughout.
Carberry has fallen for 50 at the BrightonandHoveJobs.com County Ground, but Hampshire require just 62 from 60 to defeat Sussex.
9:16pm - Muhammad Azhar Ullah strikes twice in his fourth over to complete excellent figures of 4-24. Warwickshire need a mere 36 off the final set of six.
Middlesex are also set to fall short at the Kia Oval, but Notts and Hampshire look good to complete successful chases.
9:08pm - Chris Woakes and Ateeq Javid depart in quick succession and it will take something special to deny Northants now.
Surrey are turning the screw at the Kia Oval, with Azhar Mahmood and Jade Dernbach proving economical.
Ravi Bopara bowls Darren Stevens in his first over, leaving Kent, who are chasing 165 to beat Essex, 61 for three after nine.
9:01pm - A six from Neil Dexter reduces Middlesex's target to 46 from 24 balls.
Two successive sixes for Carberry. Hants 34/2
— Sussex CCC (@SussexCCC) July 5, 2013
8:56pm - David Wainwright removes Alex Hales and Riki Wessels with consecutive deliveries to give Derbyshire a glimmer of hope.
Sam Billings departs to Reece Topley at Canterbury, while Warwickshire now need almost 14 an over.
8:53pm - The three sides batting in the South Group are all struggling.
Middlesex have lost Gareth Berg and now require 64 from six overs.
Kent have mustered just 30 runs in their powerplay.
And Hampshire are 12 for two in reply to Sussex's 145 for six.
8:46pm - We could have another nail-biter at the Kia Oval. Middlesex are 79 for four in the 13th and need a further 69.
8:40pm - Notts should not have any problems hunting down 115, especially given the start they have made. Michael Lumb has hit four boundaries in 10 balls.
Graeme White has 2-13 for Northants, who are in complete control with Warwickshire needing 93 at almost 12 an over.
8:30pm - RESULT! Yorkshire Vikings (152/6) tie with Lancashire Lightning (152/5) at Headingley - And we have a tie in the Roses match! Croft hits two from Ryan Sidebottom's final delivery to ensure the game finishes all-square. My oh my!
Former Yorkshire spinner Gareth Batty has 2-2 at the Kia Oval, where Middlesex have slumped to 45 for four chasing 148.
Warwickshire are 58 for three in the 10th and up against it, while Kent have lost Sam Northeast first ball.
8:26pm - Make that 10 from six required for Lancashire. This is a thrilling finish at Headingley...
Scott Styris' unbeaten 39 helps Sussex scramble to 145 for six. I imagine Hampshire will be happy chasing that.
8:23pm - Lancashire, with Steven Croft and Kabir Ali in occupation, need 24 from 12 balls.
Derbyshire post 114 for nine, which is unlikely to be enough.
Warwickshire and Middlesex are two down, for 38 and 35 respectively, while Shah was bowled by Mitchell Claydon for 59 prior to Essex ending on 164 for six.
8:20pm - RESULT! Somerset (192/6) beat Gloucestershire Gladiators (190/6) by four wickets at Taunton - Craig Meschede marks his arrival at the crease by striking 10 from the first two balls he faces and Somerset duly make it home with one delivery to spare, Kieswetter's unbeaten 89 from 55 the key contribution!
8:15pm - RESULT! Leicestershire Foxes (176/5) beat Durham Dynamos (165 all out) by 11 runs at Grace Road - Durham fall short, their chances having been severely damaged when Leicestershire claimed four wickets for no runs late in the chase.
Somerset 175-5 with 9 balls left, needing a further 16. Hildreth bowled Fuller 8. Kieswetter 89 not out.
— Gloucestershire CCC (@Gloscricket) July 5, 2013
8:10pm - Durham aren't giving up just yet. Gareth Breese goes six, four, six off Shiv Thakor to leave 20 needed from eight.
Owais Shah and Ryan ten Doeschate have shared a useful fifty alliance for Essex and the latter soon has reason for celebration...
ANOTHER SIX! Shah reaches his 50 for Essex! Currently 142-4! With 2 overs left!
— Essex Cricket (@EssexCricket) July 5, 2013
8:05pm - Buttler hits two more fours before falling with Somerset 29 shy of their target.
Lancashire need 50 from five overs and you'll forgive ecb.co.uk for paying extra attention to those two matches as they move towards intriguing conclusions.
8:01pm - Goodness me! Durham have lost four wickets with the score on 130, Michael Richardson and Ryan Pringle both registering ducks as Leicestershire close in on glory.
Somerset need 39 off four overs. Kieswetter has 85 and Buttler 20 from nine.
Lancashire have slowed up dramatically at Headingley and suddenly require more than nine an over.
Derbyshire's evening goes from bad to worse, Samit Patel claiming his second and third scalps to leave the score reading 84 for eight.
7:56pm - Ireland gets rid of Mustard next ball, for 69, and Leicestershire are surely favourites now at Grace Road.
Derbyshire are 80 for six in the 15th and could well lose their unbeaten record in the North Group this evening.
Kieswetter and fellow England international Jos Buttler share four maximums in 12 balls to keep Somerset's hopes alive.
7:52pm - Surrey, badly undermined by Ravi Patel's 4-18, finish on 147 for nine at the Kia Oval.
Stokes falls to Ireland for 35, with Durham needing 47 from 28 deliveries.
Lancashire lose Katich for 18 and now need 61 off 50 with seven wickets in hand.
Rory Hamilton-Brown and Dwayne Smith depart cheaply, leaving Sussex 82 for four at halfway.
7:48pm - Mustard clubs Matthew Hoggard for six to pass 50, but his team still need more than 10 an over.
Somerset also face a stiff task. Their target is 92 from 48, although Kieswetter is now on to 60.
Lancashire appear on course for a Roses win.
Essex and Derbyshire are struggling having lost their fourth and fifth wickets respectively.
Northants finish with 161 for two against Warwickshire, Coetzer top-scoring with 71 not out.
7:39pm - Sussex's other opener falls as Danny Briggs has Chris Nash caught and bowled for 23.
Ten overs have been bowled at Derby, where the hosts are 64 for four following Wayne Madsen's exit to a run out.
Surrey are seven down, while Mustard and Ben Stokes appear key to Durham's chances...
— Durham Cricket Club (@DurhamCricket) July 5, 2013
7:34pm - Northants lost White to Jeetan Patel for 28 and are 131 for two with three overs to come, Coetzer having moved past 50.
Shivnarine Chanderpaul has gone for 13, which means Derbyshire are struggling at 45 for three after eight.
At Canterbury, Essex are also three down, Graham Napier and Hamish Rutherford having departed in successive overs.
Chris Wood has ended Sussex's opening stand at 45 with the wicket of Luke Wright in his second over, the innings' fifth.
7:28pm - It's hard to keep up with all the action now that eight games are in progress.
Patel ends his third over with 4-13, having dismissed Azhar Mahmood to leave Surrey in big trouble at 88 for six.
Phil Mustard is scoring freely at Grace Road, but Durham are three down after Will Smith was run out.
Both Lancashire openers have fallen in quick succession, Liam Plunkett and Richard Pyrah the men to resurrect Yorkshire hopes.
7:25pm - Tom Smith takes 24 (TWENTY-FOUR!) from Jack Brooks' second over to put the Lightning in control at Headingley.
Somerset lose Peter Trego to be 47 for two in the sixth chasing 191.
Northants are still going well, but Surrey have lost Vikram Solanki and Zafar Ansari, the latter a third victim for Patel.
7:17pm - Sussex have roared out of the blocks with a flurry of fours against Hampshire.
Durham are not going quite so well, having lost Scott Borthwick cheaply to be two down.
Craig Kieswetter is teeing off for Somerset, but Essex's Greg Smith will not add to his 19. He has been bowled by Vernon Philander.
7:10pm - Ravi Patel dramatically breaks Surrey's momentum, dismissing Ponting and Roy with successive balls!
Chesney Hughes goes for a duck at Derby, while Northants are 82 for one after 10 overs.
Greg Smith got Leicestershire off to a flier earlier and the Essex player of the same name is doing likewise for the Eagles at Canterbury!
7:06pm - Roy's fifty arrives from 30 balls; he has dominated a very handy partnership with Ricky Ponting.
Ian Butler picks up an early wicket for Notts when Wes Durston is caught behind for six.
Durham are another side to lose an opener cheaply, stand-in skipper Mark Stoneman departing at the hands of Anthony Ireland.
7:01pm - Somerset's run-chase gets off to the worst possible start as James Fuller bowls Marcus Trescothick for a golden duck!
Durham are also under way in their pursuit and play has commenced at Derby and Canterbury.
Ateeq Javid has ousted Levi for 35, a much-needed breakthrough for Warwickshire.
6:55pm - Richard Levi made just one on his Northants debut last week, but is faring significantly better tonight. He and Coetzer have rushed the Wantage Road hosts to 55 from six overs against Warwickshire
Yorkshire did finish strongly at Headingley, reaching 152 for six thanks largely to Jaques’ 66 not out from 57 balls. Andy Hodd hit the last ball of the innings for four after Richard Pyrah had been run out.
Roy's fun continues with a brace of maximums off Toby Roland-Jones. The opener now has 42 off 24 deliveries, with Surrey 54 for one at the end of their powerplay.
6:45pm - Burns finishes unbeaten on 81 from 52 as Leicestershire post 176 for five.
Gloucestershire subsequently close on 190 for six, Alex Gidman adding a quickfire 36 before being run out off the last ball.
Jason Roy is going well as Surrey look to shake off their early setback.
Sussex Sharks have won the final toss of the day and will set a target for Hampshire Royals.
WICKET: Plunkett drills Kabir Ali to Croft at long on for 12 after being dropped two balls earlier. Yorks 123-5 off 17.4
— Yorkshire CCC (@Yorkshireccc) July 5, 2013
6:38pm - Leicestershire are five down now but Burns is still bashing the boundaries.
Gloucestershire have 169 on the board with two overs to come, while Phil Jaques has passed 50 for Yorkshire, who could do with a late flourish.
Northants have made a swift start through Richard Levi and Kyle Coetzer, but Surrey have lost Steven Davies for five in the second over of their innings.
6:33pm - Gary Ballance launches Croft for six only to be caught attempting to repeat the trick next ball.
Notts Outlaws will field first at Derby, while Kent Spitfires have also chosen to insert their opponents, Essex Eagles.
6:29pm - As the early games approach halfway, both Leicestershire and Gloucestershire are on course for imposing totals.
Yorkshire, however, have work to do. Lilley and Parry have taken 2-43 between them from eight overs and the Vikings have just 99 on the board with five to come.
The matches at Wantage Road and the Kia Oval have started.
6:22pm - Gloucestershire's Marshall is caught and bowled by Max Waller one short of 50 and Cockbain swiftly follows to Kirby for 63 as Somerset hit back.
There is a second half-centurion at Grace Road, Burns following Smith to the landmark with his third six.
Lilley continues to do a fine holding job for Lancashire, who are keeping Yorkshire below seven an over for the time being at least. The T20 debutant adds to his good work by trapping Adil Rashid lbw.
6:17pm - Leicestershire overseas star Shakib Al Hasan falls to Ryan Pringle for one.
After a slow start, Gloucestershire are now scoring at a rapid rate. Cockbain and Marshall have put on 100 for the third wicket inside 10 overs.
Northants Steelbacks have opted to bat against Warwickshire Bears in the other game starting at 6:30pm
6:13pm - Cockbain really has upped the ante and brings up a fifty from 30 balls as Gloucestershire continue their surge.
Durham have ousted Greg Smith for a 45-ball 67, but Burns remains having been dropped at long-on by Will Smith.
At Headingley, spinners Arron Lilley and Stephen Parry are keeping things tight, the latter having ousted Dan Hodgson for 13.
6:04pm - Ian Cockbain hits four boundaries in six balls off Craig Meschede, including a maximum, to significantly boost the Gloucestershire total.
Yorkshire are 54 for one after seven at Headingley, while Leicestershire have 85 on the board at the halfway stage against Durham.
Middlesex Panthers have won the toss at the Kia Oval and will bowl first against Surrey.
50 for Smith! It took him 33 balls with 8 fours and 1 six #FLT20
— Leicestershire CCC (@leicsccc) July 5, 2013
5:56pm - Yorkshire reach 32 without loss from four overs prior to Gale being caught behind off Tom Smith's first ball.
Leicestershire are flying, but Gloucestershire's progress is more sedate at this stage.
5:50pm - Mitchell McClenaghan comes in for some punishment as Andrew Gale collects a four and a six in the New Zealander's opening over.
At Grace Road, Leicestershire end the powerplay on 39 for one with Joe Burns now alongside Smith.
5:42pm - Smith finds the fence three more times off Ben Stokes and has 26 of Leicestershire's 27 when opening partner Josh Cobb falls to Chris Rushworth in the fourth over.
Somerset strike twice in quick succession, Arafat removing the in-form Michael Klinger for eight before Steve Kirby has Chris Dent lbw for a duck.
Steven Croft opens the bowling for Lancashire at Headingley and concedes just four in his first set of six.
5:37pm - The vastly experienced pairing of Yasir Arafat and Alfonso Thomas have started well with the ball for Somerset, but Greg Smith is doing his best to give Leicestershire early impetus against Durham, striking a trio of early fours.
5:31pm - Gloucestershire and Leicestershire begin their innings, while we are minutes from the start of an eagerly anticipated Roses clash at Headingley. Yorkshire's meeting with Lancashire is being televised live on Sky Sports.
5:18pm - Not long then until the first two of our eight games get under way.
Who will be the stars of the evening?
First job done. Chapple wins toss and Lancs will bowl. Lilley debuts.
— Lancashire CCC (@LancsCCC) July 5, 2013
5:06pm - Gloucestershire have won the toss at Taunton and will bat first, while Durham have elected to field at Grace Road.
Who's going to headingley!?! The atmosphere will be electric! Come on you Vikings!!!
— Jonathan Bairstow (@jbairstow21) July 5, 2013
5pm - Good evening and welcome to ecb.co.uk's live blog coverage of tonight's Friends Life t20 fixtures.
There are a host of derby matches taking place this evening in front of sell-out crowds. Here is a rundown of who is playing whom:
Leicestershire Foxes v Durham Dynamos (5:30pm start)
Yorkshire Vikings v Lancashire Lightning (5:40pm)
Derbyshire Falcons v Notts Outlaws (7pm)
Somerset v Gloucestershire Gladiators (5:30pm)
Northants Steelbacks v Warwickshire Bears (6:30pm)
Surrey v Middlesex Panthers (6:30pm)
Kent Spitfires v Essex Eagles (7pm)
Sussex Sharks v Hampshire Royals (7:10pm)