Yorkshire make record 227-5 & beat Notts
Surrey beat Essex by two runs
Birmingham Bears beat Worcs by eight wickets
Buttler hits 59 off 39 balls for Lancs
Wins for Lancs, Hants & Derbys
Glos & Middlesex tie early game
Essex v Surrey 177-7
Dominic Sibley produces a lovely-looking reverse guide down to the third man boundary for four, before he survives a very close lbw appeal.
Surrey have lost wickets throughout, but look on to post a decent total.
Around the grounds
A composed 75 from Ian Bell has helped Birmingham Bears win by eight wickets against West Midlands rivals Worcestershire Rapids.
Bell helped the visitors reach their target of 153 for the loss of just two wickets, with one full over to spare.
Sam Hain's 47 had given them an opening partnership of 98.
Essex v Surrey 164-7
Well batted Dominic Sibley. He brings up a third T20 fifty with a pull shot off Mohammad Amir into the legside. What can he do now?
Essex v Surrey 161-7
Dominic Sibley finds a lovely shot, picking up Ryan ten Doeschate over the legside for six. It's another dropped catch in the well-oiled Chelmsford crowd.
10 runs off the over. Sibley is on 48 runs off 34 balls. Two overs to come.
Image source, Rex Features
Essex v Surrey 151-7
Ryan ten Doeschate brings himself onto bowl, becoming the seventh bowler in the process. He's probably doing it to speed up his side's over-rate but it's worked wonders.
An off-cutter beats Tom Curran all ends up, knocking out his leg stump.
Essex v Surrey 151-6
Shot! Dominic Sibley has got his eye in now. He steps across and flicks a short of a length ball from Ravi Bopara over the legside for a towering six.
Sibley has 41 from 32 balls now. Bopara finishes his four overs with impressive figures of 2-23. Well bowled Ravi.
Essex v Surrey 141-6
Impressive stuff from Paul Walter. Sam Curran gets down and scoops the left-armer for a four down to fine leg, but the Essex bowler responds in the perfect way, knocking Curran's legstump back with a quick one.
Sam is replaced by older brother Tom in the middle having made 25 from 16 balls.
Mohammad Amir is in the team for his fast bowling, but the Pakistan paceman can also field, as he showed. Watch him catch Ollie Pope off Ravi Bopara's slower ball below.
Around the grounds
Elsewhere, at the interval in two of tonight's other games, Jos Buttler (59) helped Lancashire Lightning reach 192-6 against Durham Jets, while Ben Duckett's 69 led Northamptonshire Steelbacks towards 179-6 against Derbyshire Falcons.
Both those matches appear to be finely in the balance.
Essex v Surrey 130-5
Jamie Porter bowls a nasty full toss straight into Dominic Sibley's midrift. Sam Curran smashes the resulting free hit through the offside for four before depositing a short ball over the legside for six.
Great over for Surrey - 16 runs from it.
Around the grounds
Glamorgan need just 168 to beat Hampshire, after limiting the visitors to 167-5 from their 20 overs in Cardiff.
Lewis McManus (59) top scored for Hampshire, while Glamorgan's Andrew Salter (1-10) was impressively economical from his three overs.
Essex v Surrey 114-5
Paul Walter gets one through at 89.1mph on the speed gun. It's impressive pace from the left-armer, but Dominic Sibley creams a pull shot through the legside for four.
Seven runs from the over. Surrey need a partnership before the final push.
Essex v Surrey 107-5
Image source, Rex FeaturesRyan ten Doeschate continues to rotate his squad as Mohammad Amir comes back on to bowl his third over.
Sam Curran does very well to dig out a yorker and find the offside boundary rope. Eight runs come off the over as an appeal for lbw is turned down and two leg-byes are run off the final ball.
Surrey's run-rate is a healthy 8.23. It's just the loss of wickets that may prove the problem as they look to up it later on.
Around the grounds
Yorkshire Vikings have set Nottinghamshire Outlaws a target of 228 to win from their 20 overs, after the hosts posted 227-5 in Leeds.
Shaun Marsh (60 not out) and Adam Lyth (82) led the Vikings' charge, while Harry Gurney took 3-49 for the Outlaws.
Image source, Rex FeaturesEssex v Surrey 99-5
Expensive over from Simon Harmer, with 13 runs coming off his second over.
Dominic Sibley does most of the damage, hitting one over wide mid-on and into the second tier where a man in the crowd embarrasses himself by shelling the catch.
It all seems such a long time ago already, but Aaron Finch has been the only Surrey batsman to time the ball well.
Watch him reach fifty with a big six off Ashar Zaidi.
Around the grounds
England's Jos Buttler is going well on 59 not out as Lancashire Lightning sit 169-4 off 17.4 overs. Buttler has hit six boundaries so far, including a couple of sixes, against Durham Jets.
Elsewhere, Shaun Marsh has also made a 50 for Yorkshire Vikings (219-5 off 19.4 overs)against Nottinghamshire Outlaws.
Essex v Surrey 86-5
Ravi Bopara takes another wicket!
Ollie Pope falls for two off six balls, sweeping Bopara's slower ball out to Mohammad Amir on the boundary, who takes a good running catch in the sun.
Surrey getting bogged down here.
Image source, Rex FeaturesEssex v Surrey 85-4
Simon Harmer, who is the highest wicket-taker in the County Championship this season with 47 scalps, comes onto bowl for the first time.
Big pressure on the shoulders of Dominic Sibley and Surrey T20 debutant Ollie Pope now.
Harmer fires one down the legside, conceding four leg-byes. Nine runs from the off-spinner's first over.
Essex v Surrey 76-4
Huge wicket for Ravi Bopara!
The former England man is a useful bowler and he proves it, getting rid of the danger man Aaron Finch. The Australian cuts for four, but edges behind to James Foster trying to recreate the shot from a ball too close to him.
He made 56 from just 27 balls, but Essex are well on top here.
Image source, Rex Features