Sam Curran takes 5-26 as Surrey beat Somerset to leapfrog them at top of South Group
Birmingham Bears go top of North Group with 21-run win at Worcestershire
Lyth (90 not out) & Malan (79) ease Yorkshire to eight-wicket win over Leicestershire
Croft hits 101 to set up Lancashire win by 35 runs at Northants
Champions Hampshire slip to narrow six-run loss at Sussex in last-over thriller
Essex recover from 1-2 to chase 176 to win and beat Glamorgan by four wickets
Haider hits last ball for four as Derbyshire earn tie at Durham
Kent beat Middlesex by 13 runs despite 121 not out by Holden
Essex v Glamorgan 80-3 (9 overs)
Essex have really pulled Glamorgan back in with two more wickets.
Simon Harmer removed fellow South African Colin Ingram with his first ball and now Shane Snater has got rid of captain Kiran Carlson for 43.
Yorks v Leics 156-4
Image source, Rex FeaturesThat's more like it by Leicestershire.
Wiaan Mulder hits two successive sixes over square leg off Ben Mike and their total passes 150.
A boundary by Mulder ends the 17th over, which cost Mike 22.
Northants v Lancashire 160-3 (15.1 overs)
Steven Croft's lusty hitting has now taken him into the nineties.
He clubs one from Andrew Tye down to the fence and he is now up to 92 not out and Lancashire still have Liam Livingstone waiting in the wings!
Durham 138-5 (15.3 overs) v Derbyshire
Zaman Khan with the big wicket for Derbyshire as Brydon Carse goes for 58.
The Pakistan quick now has 3-12 and looks a real handful.
Kent 193-3 (18.1 overs) v Middlesex
Image source, Rex FeaturesJoe Denly goes to his fifty with a rather scabby edge - his eighth boundary and comfortably the least classy of them!
Somerset v Surrey 124-4
The match has tilted away from Surrey at the moment with Tom Curran top edging an attempted pull off Matt Henry.
He departs for two as Craig Overton takes the catch safely and you have to wonder why Surrey have waited until now to send in Sean Abbott - 15 overs are complete.
Yorks v Leics 132-4
Great stuff by Yorkshire, who don't concede a single boundary in overs 13 to 15.
There's one at the start of the 16th, though, as Louis Kimber hits Dom Bess for four.
Durham 134-4 (15 overs) v Derbyshire
Brydon Carse is the key batter for Durham. He is up to 56 off 28 balls with two fours and four big ones.
They need plenty more of those in the last five overs.
Somerset v Surrey 121-3
That's why Jamie Overton is out there at four for Surrey - he hammers Roelof van der Merwe's opening delivery of a new over for six.
Will Jacks follows suit over mid-wicket two balls later but now he's gone, caught at long-off after getting underneath a full toss. Tom Curran replaces him and there are six overs left.
Birmingham Bears 196-5, Worcestershire 62-2 (7 overs)
Almost parity in the Pears-Bears derby at New Road.
The Bears were 59-1 after six earlier. The Pears are 55-2.
Brett D'Oliveira and Adam Hose have turned things round from 11-2 with a fifty stand.
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Joe Gibney: Middlesex might as well change their name to "Middlesex lost", as the second word always seems to follow the first. Even the hopeless Kent Spitfires are having a good night.
Kent seem well placed to pass 200 at Lord's with Joe Denly and Sam Billings still at the crease.
Northants v Lancashire 125-3 (13 overs)
Steven Croft brings up the 100 partnership between him and Daryl Mitchell in grand style as he smashes Saif Zaib over deep long-on for six.
This fourth-wicket stand has only taken 50 balls.
Essex v Glamorgan 55-1 (6 overs)
The safe hands of Tall Paul Walter sees the back of Sam Northeast and the first Glamorgan wicket to fall at Chelmsford.
It's part of an excellent Daniel Sams over that goes for just a single.
It has helped to quell some of the momentum Glamorgan were building.
Somerset v Surrey 105-2
Tom Abell barely has to move as Sam Curran carves a ball from Josh Davey straight to him at deep extra cover.
A useful little knock by the England all-rounder but Surrey need more than 'useful' with seven overs remaining.
That explains why Jamie Overton is in at four against his old team-mates.
Yorks v Leics 110-4
He'd been there since the start but now Harry Swindells is gone, caught by Adam Lyth at mid-wicket as David Wiese strikes in the 13th over. Wiaan Mulder is the new Foxes batter.
Somerset v Surrey 100-1
There have been a lot of dot balls in this innings, so credit to the Somerset bowlers for that.
It's a leg bye from the second of the 13th over, bowled by Josh Davey, which pushes Surrey's score to 100.
Sussex 49-2 (4 overs) v Hampshire
Reigning champions Hampshire have made a double breakthrough at Lord's, removing first Harrison Ward, then Tom Clark.
A wicket each for first John Turner, then Chris Wood.
Ravi Bopara has come on to join Oli Carter.
The Sussex batters are looking for better after last week's lambasting from their boss Paul Farbrace.
Northants v Lancashire 101-3 (11 overs)
The veteran batter is playing a fine hand for the Red Rose.
A lovely flick down to deep square gets him four off Andrew Tye and that brings up his 50 off 28 balls with three fours and three big sixes.
Essex v Glamorgan 52-0 (4.4 overs)
Only 28 balls and the Glamorgan fifty is up.
Captain Kiran Carlson is sending the ball to all corners of Chelmsford. He is already up to 37 off 18 balls with five fours and two sixes.
BOOM!
Yorks v Leics 100-3
Those two wickets from successive Ben Mike deliveries have taken some of the wind out of Leicestershire's sails.
Harry Swindells takes one at the start of the 12th over, bowled by Jafer Chohan, and the total reaches three figures. He is 36 not out.