Ben Stokes out for 5 on return from injury for Durham
Brendan McCullum hits 87no in last Middlesex appearance
South leaders Glamorgan beat Surrey by 9 wkts
Worcs bowled out for 53 in loss at Lancs
Birmingham top North group after win at Leics
Durham v Yorkshire 69-4 (8.1 overs)
Deary me, Gary Ballance attempts to sweep Scott Borthwick but can only send the ball straight into the hands of wicketkeeper Phil Mustard to give the spinner his second wicket of the evening.
Tim Bresnan joins Jack Leaning at the crease with plenty of rebuilding required.
Derbyshire 4-1 (1 over) v Notts
Ouch. Derbyshire won't be pleased with that. Off just the second ball of the night, Hamish Rutherford is caught behind off the bowling of Andre Russell.
Neil Broom comes out to replace him at the crease. Notts will be happy to get one over their neighbours so early on.
Essex v Hampshire 7-0 (1 over)
Image source, Rex FeaturesWe're under way on time at Chelmsford and Michael Carberry sends debutant Paul Walter to the boundary ropes off his second ball.
Not a bad start for the Essex bowler at all, just the seven conceded off his first over.
Surrey 36-3 (6 overs) v Glamorgan
That's Surrey's powerplay over and you have to say Glamorgan will be the happier side.
Kumar Sangakkara had a nightmare at the crease, adding just two runs before Chris Cooke took his third catch of the night to further peg Surrey back.
The visitors have been trying to force as many boundaries as possible, but their aggressive batting style is costing them dear.
It rests on Rory Burns and Ben Foakes to seize the initiative.
Durham v Yorkshire 61-3 (6.5 overs)
Michael Richardson take a bow!
The Durham man takes an absolutely excellent diving catch on the boundary rope to get rid of the dangerous Alex Lees.
Lancashire 24-1 (4.1 overs) v Worcestershire
Jack Shantry drops marginally short, but Martin Guptill doesn't get hold of his pull shot and gives fellow New Zealander Matt Henry catching practice at short fine leg. The ball isn't really coming onto the bat and the solitary boundary so far by Alviro Petersen was an under-edge past his own leg stump.
Durham v Yorkshire 53-2 (6 overs)
Durham must be wishing they had 11 Chris Rushworths in the side.
Alex Lees, who was in fine form during the County Championship match this week between the two sides, sends Usman Arshad for four successive boundaries as the Vikings race past 50 at the end of the powerplay.
Lancashire 14-0 (3 overs) v Worcestershire
No overs have been lost at Old Trafford following the brief rain delay and Lancashire have got off to a sedate start against Worcestershire. Alviro Petersen picks up two fortuitous runs from a leading edge as Matt Henry's opening over yields only three runs, while Jack Shantry permits no liberties at the other end with the keeper standing up to the stumps.
Surrey 25-2 (3.3 overs) v Glamorgan
In Cardiff, 'the Steyn remover' as they call Dale Steyn these days, has worked his magic once more and Steven Davies is walking back to the pavillion thanks to a sweet Chris Cooke catch.
Kumar Sangakkara joins Gary Wilson at the crease but just four balls later, another wicket falls.
Timm van der Gugten does the damage this time as Wilson goes. Once again, Cooke takes the catch.
A mixed start in south Wales for Surrey.
Leicestershire 15-3 (4.3 overs) v Birmingham Bears
No sooner has Kevin O'Brien trudged back to the dug-out, then, one ball later, he's followed by the other players as the rain starts to fall.
We're going to have a delay.
Quote MessageAt 15-3, it's not looking good for the Foxes if Duckworth-Lewis comes into play.
Richard Rae, BBC Radio Leicester
Durham v Yorkshire 34-2 (4.5 overs)
It's absolutely brilliant stuff from Chris Rushworth who has Kane Williamson in all sorts of trouble before clean bowling the New Zealand batsman.
Alex Lees had sent Paul Coughlin's first over for 22, including hitting a huge six over cow corner, but Rushworth has just pegged Yorkshire back.
Leicestershire 13-3 (4.2 overs) v Birmingham Bears
Birmingham Bears could not have wished for a better start at Grace Road.
Leciestershire's batsmen can't get any change out of Oliver Hannon-Dalby and Rikki Clarke and, after Mark Cosgrove chips Clarke to Laurie Evans, Kevin O'Brien then follows him back to the shed after being run out by Mark Adair's direct hit.
Big trouble for the Foxes.
Derbyshire v Notts (19:00 start)
In the East Midlands derby, Notts Outlaws have won the toss and will bowl first against Derbyshire.Derbyshire name an unchanged side after their defeat by Yorkshire on Sunday, while Notts bring Brendan Taylor in for Alex Hales.
Derbyshire: Broom, Rutherford, Hughes, Madsen, Neesham, Thakor, Hughes, Poynton, Critchley, Cotton, Carter.
Notts: Lumb, Wessels, Taylor, Christian, Patel, Smith, Russell, Mullaney, Wood, Ball, Gurney.
Kent v Middlesex (19:00 start)
Middlesex have won the toss at Canterbury and chosen to bat first.
Kent must manage without batsman Daniel Bell-Drummond, their leading T20 run-scorer, because of a hand injury and all-rounder Matt Coles, but have Sam Billings back in their side.
Middlesex bring in Harry Podmore for England paceman Steven Finn, while Mitch McClenaghan's T20 Blast involvement is over because of a stress fracture of the pelvis. Brendan McCullum plays his final game before heading for the Caribbean Premier League.
Kent: Latham, Denly, Northeast, Billings, Blake, Stevens, Cowdrey, Tredwell, Claydon, Griffiths, Hunn.
Middlesex: Malan, McCullum, Stirling, Gubbins, Simpson, Franklin, Higgins, Roland-Jones, Fuller, Sowter, Podmore.
Durham v Yorkshire 16-1 (3 overs)
Usman Arshad should claim the important wicket of Kane Williamson off the first ball of his over as he strangles the New Zealander down the leg side but wicketkeeper Phil Mustard shells the ball.
Despite the mistakes in the field, it has been a tight first few overs by the hosts at Chester-le-Street.
Essex v Hampshire (19:00 start)
All-rounder Paul Walter makes his debut for Essex, having recently signed his first professional contract.
Hampshire youngster Joe Weatherley plays his first T20 game in place of Adam Wheater.
Essex: Ryder, Velani, Westley, Bopara, ten Doeschate, Lawrence, Zaidi, Foster, Napier, Walter, Quinn.
Hampshire: Carberry, Alsop, Weatherley, Dawson, Ervine, Afridi, McManus, Sammy, Andrew, Berg, Best
Leicestershire 8-1 (2.1 overs) v Birmingham Bears
A good start for Birmingham Bears at Leicestershire.
Only eight come off the first two overs before Sam Hain takes a steepling catch at cover to remove home captain Mark Pettini off Oliver Hannon-Dalby's bowling.
Lancashire v Worcestershire
A passing shower has prevented a prompt start at Old Trafford, but there are plenty of clear patches of sky around, and play is expected to get under way soon.
Durham v Yorkshire 4-1 (0.4 overs)
We have our first wicket of the evening!
Adam Lyth is lucky to survive the first ball off Chris Rushworth as he drives the straight through Mark Stoneman's legs but he is bowled by the Durham paceman as he looked to tee off.
A big loss at the top of the order for Yorkshire. Kane Williamson walks to the crease.
England v Sri Lanka
Image source, APOf course, we're not the only cricket on this evening, with England playing Sri Lanka in the second one-day international at Edgbaston.
England's pursuit of Sri Lanka's 254-7 is under way and you can follow it here.