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Jason Roy has lifted spirits for T20 Blast strugglers Surrey with the type of innings that has earned him his England place.

He's been steadily impressive, dominating his opening partnership with Dean Elgar and hitting three fours and reaching his half-century with his third six. His 50 came off 39 balls and included three fours and three sixes.

Glamorgan are slowing the run rate since Elgar was dismissed but can Surrey make the most of wickets in hand?

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Powerful Jesse Ryder smashes a six in the opening over and Essex add five boundaries in the next two as they make a fast start at Chelmsford.

Good news at Derby where the covers are coming off.

Play is due to start at 19:30 BST if there's no more rain. No overs have been lost.

Paceman Kyle Jarvis has taken 55 wickets in the Championship for Lancashire this summer, but that cuts no ice with Brendon McCullum, who slashes his first boundary for Birmingham Bears and then adds two more for good measure of the next two deliveries, hoiking the second through mid-wicket before lofting over the head of the mid-off fielder. Anyone remember Tommy Steele's 'Hold it, crash, bang, wallop'...

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Yorkshire start their reply under cloudy skies with Aussie dynamo Aaron Finch and skipper Andrew Gale, who has five 50s in his last six T20 knocks against Leicestershire.

But danger man Finch is trapped lbw by his international team-mate Clint Mckay! A great start for the hosts as Finch's disappointing form continues.

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Oh, goodness me. Opta Jim, and the rest of us, owe Moeen Ali a bit of an apology.

The England all-rounder gets a first-ball duck as Worcestershire set about their chase, with Rob Keogh snaffling a catch off the bowling of Rory Kleinveldt. What a start.

From OptaJim:, external "82.4 - Moeen Ali has (82.4%) has the highest boundary run percentage in @NatWestT20Blast 2015, minimum 20 balls faced. Aggressive."

Here we go then, the teams are back out, Worcestershire need 194 to win...

Steady stuff from Surrey and Jason Roy in Cardiff against Glamorgan, though he's just been dropped by Graeme Wagg off the bowling of Andrew Salter.

The England one-day opener has 41 from 30 balls after eight overs but has not truly cut loose.

Wickets in hand seem to be in mind for Surrey, who need victory to climb off the bottom of the table.

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It's like the World Cup final revisited at Old Trafford where Australia's man-of-the-match James Faulkner will open the bowling for Lancashire, with New Zealand captain Brendon McCullum opening the Birmingham innings with Varun Chopra.

Game on.

BBC Radio Test Match Special

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We are on the air from Old Trafford! Lancashire v Birmingham on @5liveSport #TMSt20

From Essex Cricket:, external "Hampshire are our bogey team in Twenty20 cricket, having won 6 of the last 6 v us. No better time than now to put that right! #EssvHam"

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BBC London 94.9's Mark Church: "Surrey have missed Jason Roy firing in the competition so far this season, but he's firing now."

The England one-day opener has just deposited Dean Cosker for six after earlier dumping another maximum into the River Taff. Roy is closing on a half-century for Surrey.

The rain chooses its moments, doesn't it? Just 15 minutes from the scheduled start at Derby and the covers go on.

There will be a delayed beginning to the battle of the basement.

BBC Radio Northampton's Alex Winter on Twitter: Doesn't look like David Willey, who was injured batting, is going to take the field. Big blow for @NorthantsCCC #bbccricket #T20Blast

Sussex will be glad to see the back of the prolific Michael Klinger, who finally mistimes one. skying a Chris Liddle delivery to allow Cachopa to take a catch he had plenty of time to wait for.

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Some late lusty blows from Steven Crook and Rory Kleinveldt helped Northants get back on track and gain the momentum at the halfway point against Worcestershire.

Kleinveldt bludgeoned 42 from 12 balls and Crook finished unbeaten on 56 as Northants added 61 runs in the last three overs.

Despite a blistering start by Northants, they were 112-5 with six overs left after some tidy bowling from Brett D'Oliveira, who also ran out Josh Cobb.

But the end-of-innings fireworks have left group leaders Worcestershire with a great deal to do.

John Simpson hits all 14 of the runs that come off the final over of the innings to take his personal score up to 84 off 51 deliveries - the best of his T20 career. You have to say that total looks a bit short of what Middlesex would have expected after the start they made.

The final couple of overs are left to the bowlers as Clint McKay and Ben Raine try to build a target they can defend.

McKay manages a four off Patterson in a penultimate over which goes for 11, but that's it for the boundary count as Fisher restricts the Foxes to a measly three singles and two byes at the death.

Yorkshire will be mighty pleased with their efforts in the field, but will they also struggle for momentum on this pitch? We shall find out in 15.

From OptaJim:, external "1 - Graham Napier needs one wicket to become the 8th bowler to take 100 wickets in English domestic T20s. Target. @EssexCricket"

Ollie Rayner tries a reverse sweep that goes all wrong as Tim Groenewald takes another key wicket. That's seven down for Middlesex, who haven't really capitalised on a superb start to the night. What can they get the score up to in the closing few balls?