Postpublished at 6 overs
Middlesex v Surrey 56-2
Time for some spin as Chris Green enters the attack.
He'll be bowling to Jason Roy on 47 from 21.
Five T20 Blast matches
Surrey beat Middlesex by 20 runs
Surrey make it six wins in seven games
Northamptonshire beat Worcestershire; Derbyshire beat Leicestershire in North Group
Hampshire beat Essex & Somerset beat Gloucestershire in South Group
Josef Rindl and Gary Smee
Middlesex v Surrey 56-2
Time for some spin as Chris Green enters the attack.
He'll be bowling to Jason Roy on 47 from 21.
Middlesex v Surrey 56-2
Mark Church
BBC Radio London
There's a bit of movement, bit of bounce from Toby Roland-Jones and Sam Curran has to go without scoring.
It's a very good over from Toby Roland-Jones.
Middlesex v Surrey 56-2
Brilliant over to end the Powerplay from TRJ.
Just one run and one wicket from it.
Curran c †Simpson b Roland-Jones 0 (Middlesex v Surrey 56-2)
The momentum has shifted!
Toby Roland-Jones sends in a cracking out-swinger that Sam Curran can only feather to the keeper.
He goes for a duck and suddenly it's game on again.
Laurie Evans is the next batter in.
Middlesex v Surrey 56-1
Middlesex are building the pressure now.
Just one run off Toby Roland-Jones' first three balls in the sixth over.
Jacks c Eskinazi b Behrendorff 9 (Middlesex v Surrey 55-1)
A much-needed wicket for Middlesex as a leading edge from Will Jacks launches the ball into the air.
Skipper Stevie Eskinazi is under it to take an easy catch.
England's Sam Curran is in at number three.
Middlesex v Surrey 54-0
Jason Roy starts Jason Behrendorff's second over with a three.
Then Will Jacks immediately gives him back the strike with a single.
Middlesex v Surrey 50-0
Mark Church
BBC Radio London
For the quick bowlers coming from this Nursery End, there's not even a deep mid-wicket out there.
The only chance if you sit a so-called sweeper on that Grandstand side then put them in the hospitality box because that's the only place they're going to get anywhere near the ball.
Mishits are going for six tonight.
Middlesex v Surrey 50-0
Jason Roy keeps the strike with a single to bring up Surrey's 50 after four overs.
Roy is now on 42 from 18.
Middlesex v Surrey 49-0
And another six for Roy, slashing the ball over backward-point.
This could get ugly soon.
Middlesex v Surrey 43-0
Brilliant hands from Jason Roy, cutting Tom Helm for four.
He's already on 35 from just 14 deliveries. Lightning start from the England batter.
Middlesex v Surrey 38-0
So close!
Jason Roy edges the last ball of the over but it's out of the keeper's reach.
Middlesex needed that chance to stick. The ball trundles over for four.
Middlesex v Surrey 34-0
Straighter one and Jason Roy simply flicks his wrists, sending the ball over the boundary for six.
How did he get that much power on the ball? His shot looked almost lethargic.
First maximum of the innings.
Middlesex v Surrey 28-0
Jason Roy looks in the mood tonight, this time dispatching Toby Roland-Jones on the offside for four.
Too much width on offer from Middlesex's bowlers at the moment and Surrey are happy to lap it up.
Middlesex v Surrey 23-0
Chris Peddy
BBC Sport at Lord's
The clouds are looking a lot lighter around Lord's than they were half an hour ago so hopefully we can look forward to a clear evening for this London derby.
There's a nice big crowd for this one - they've already seen some boundaries from the Surrey openers but it's early wickets the home fans will be after to get them out of their seats.
Middlesex v Surrey 23-0
Lovely stuff from Jason Roy who ends the second over twice carving the ball beyond backward-point.
He moves on to 17 off nine.
Gloucestershire opener Miles Hammond has struck Somerset seamer Tom Lammonby for four sixes in the first over of the match with 24 coming off it.
Ridiculous!
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Middlesex v Surrey 16-0
We continue with pace as Jason Behrendorff starts his over with two singles and a dot ball.
The derby between Gloucestershire and Somerset and Northamptonshire Steelbacks v Worcestershire Rapids are getting under way.
Gloucestershire and Northants are batting.
We'll bring you regular updates from those two.
Middlesex v Surrey 13-0
Great footwork from Jason Roy who goes down the ground to pump Tom Helm over the top for four.
Next ball he keeps the strike with a quick single to the legside.
Good start for Surrey, 13 runs off the first over.