Eight group matches across the country in the North and South groups
England bowler Ollie Robinson returns to action for Sussex against Gloucestershire
Ollie Pope scores unbeaten 52 for Surrey, Ben Stokes makes 20 for Durham
South Group: Surrey beat Middlesex by five wickets, Somerset beat Hampshire by seven runs, Kent beat Essex by 28 runs (DLS method), Gloucestershire beat Sussex by 27 runs
North Group: Derbyshire tie with Notts Outlaws, Leicestershire beat Yorkshire by 34 runs, Northants beat Lancashire by seven wickets, Worcestershire beat Durham by eight wickets
Somerset 172-9 v Hampshire 162-5 (19 overs)
James Fuller falls off the last ball of the penultimate over for Hampshire to leave this one in the balance a touch.
Lewis Gregory to bowl the last over for the hosts at Taunton with 10 runs to defend....
Leics 203-7 v Yorkshire 164-8.
Matthew Fisher and Dom Bess are gamely trying for Yorkshire and after Bess edges for four, his partner does even better by hammering the ball over long-off for six. But there is only one over to come and they need 44 to win - the numbers are against them, barring some prodigious hitting and a no-ball or two.
Northants 107-3 v Lancashire 130-7
The boundaries have dried up for Northants, with none in the last three overs. No need for panic stations, though, as they need 22 from 24 balls. Mohammad Nabi is 23 not out and Rob Keogh has eight.
Middlesex 174-7 v Surrey 146-5 (17 overs)
29 needed off 18 balls for Surrey after Jamie Overton smashes Luke Hollman for two big sixes in his last over.
Ollie Pope also got in on the act too with one in between.
22 scored off that over and it's arguably back in the hosts' favour now.
Kent 167-9 v Essex 31-4 (5 overs)
Still very, very dark overhead at Chelmsford and the ground staff have pulled on more covers on the outfield.
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Sussex 26-2 (4 overs) v Gloucestershire 162-5
Glenn Phillips' score of 94 earlier will take some beating, but performance-wise, his Gloucestershire team-mate David Payne has bowled superbly early on in this innings.
Travis Head is caught for one thanks to a comfortable catch for Jack Taylor and a poorly-timed run, which followed Phil Salt being bowled out for 11.
Leics 203-7 v Yorkshire 137-8
Mattew Waits gets underneath an angled delivery by Naveen-ul-Haq and Colin Ackermann takes a well-judged running catch. The Foxes are on course for three wins in a row.
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Middlesex 174-7 v Surrey 115-5
Image source, Getty ImagesSurrey just cannot get on top in this match.
Wickets keep falling at regular intervals to Middlesex's slower options.
Nathan Sowter has Jordan Clark well caught by Luke Hollman in the deep to leave them still needing another 60 off 33 balls.
Leics 203-7 v Yorkshire 135-7
Harry Brook tries to pull a ball from Gavin Griffiths, but it comes off the splice and flies straight back to the bowler.
Dom Bess hits the next two deliveries for four, but Yorkshire need 73 off 24 balls to win. A very tall order.
Northants 94-3 v Lancashire 130-7
Three fours in one over by Mohammad Nabi off Saqib Mahmood have tilted the match back towards Northants. They only add three singles from the next, bowled by Matt Parkinson, but require 37 from 36 balls.
Somerset 172-9 v Hampshire 138-4 (15 overs)
Still a twist in this match?
Colin de Grandhomme departs for a brilliant 66 off 34 balls with Hampshire still needing another 35 to win off 30 balls.
It gets even more interesting next ball as Lewis McManus departs for a duck leg before to Max Waller.
Kent 167-9 v Essex 31-4 (5 overs)
The skies suddenly fill in at Chelmsford and rain breezes in at the County Ground to see the covers brought on.
We have had five overs of Essex's reply so if we didn't get any more cricket, we would have a result.
The below picture was tweeted just a few moments before they came off.
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Leics 207-3 v Yorkshire 122-6
Here comes Callum Parkinson for his final over of the evening.
Harry Brook helps himself to two fours, but then takes a single and the next delivery cleans up Jordan Thompson as he attempts a big mow over the leg-side field.
He's gone for a second-ball duck and Parkinson finishes with 4-35. Yorkshire require 86 from 30 balls.
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Northants 77-3 v Lancashire 130-7
Northants may yet come to rue that as Wayne Parnell tries to dab Luke Wood down towards third man, but the deflection is too fine and he only manages to play the ball into his own stumps. Eight overs left.
Derbyshire 42-0 (4 overs) v Notts 137-9
Derbyshire will be very happy with these first few overs.
Luis Reece has come racing out of the traps and has already scored 36 off 21 balls.
Somerset 172-9 v Hampshire 117-3 (13.2 overs)
Image source, Getty ImagesColin de Grandhomme strikes his eighth four of a masterful innings so far at Taunton as he continues to guide Hampshire to victory over Somerset.
It's also included two sixes and come off just 27 balls.
Leics 203-7 v Yorkshire 103-5
To borrow a Leonard Cohen title, Yorkshire are now waiting for the miracle.
The required rate is up to 15 an over and there goes George Hill, caught by Arron Lilley at deep mid-wicket off Colin Ackermann for five.
Jordan Thompson walks out to join Harry Brook in the middle. The North group leaders have only lost one game so far - will this be the second?
Kent 167-9 v Essex 24-4 (3.5 overs)
Wickets aplenty at Chelmsford tonight.
Essex slump to 24-4 chasing 168 as Jimmy Neesham is the latest wicket to fall to Freddie Klaasen for just four.
Dan Lawrence seeing them come and go in quick succession on 17 not out.
Middlesex 174-7 v Surrey 88-3 (10.4 overs)
Laurie Evans comes and goes quickly for Surrey as Luke Hollman has him stumped for just four.
Surrey have Ollie Pope in the middle now with Rory Burns so plenty of experience as they try to steady things in the middle overs.
Northants 74-2 v Lancashire 130-7
Hope for Lancashire as Ricardo Vasconcelos holes out at deep mid-wicket off spinner Tom Hartley. Wayne Parnell hits the final ball of the over for four and he is now 23 not out, with 57 needed off 54 balls.
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