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
Gloucestershire 162-5 (20 overs) v Sussex
Image source, PA MediaHe was within touching distance of a century, but Gloucestershire's Glenn Phillips finishes the innings with an excellent 94 runs off 58 balls.
Jack Taylor's 38 helped the pair to a partnership of 132.
That's despite Sussex's Tymal Mills taking 3-20 from four overs to keep them with a fighting chance, with 163 the target.
Leics 207-3 v Yorkshire 93-4
Only eight for Yorkshire from the 11th over of their innings, bowled by Gavin Griffiths. They need more than that and suffer another body blow at the start of the next as Gary Ballance tries to cut a ball that is too close to him and chops into his stumps. George Hill is next man in.
Northants 57-1 v Lancashire 130-7
Lancashire call up Matt Parkinson, and he needs some of his brother Callum's wicket-taking magic not too far away at Leicester. It's a decent first over, yielding only four singles, but no breakthrough. The Steelbacks need 73 off 66 balls to win.
Middlesex 174-7 v Surrey 79-2 (9 overs)
Spin continues to do the business for Middlesex as Nathan Sowter has Jamie Smith caught on the boundary by Daryl Mitchell.
That's both Surrey openers back in the hutch and the visitors will hope their slower bowling will be able to tighten the squeeze on Surrey from here.
Somerset 172-9 v Hampshire 83-2 (9 overs)
Colin de Grandhomme could be making a timely arrival here for Hampshire.
He's unbeaten on 39 with D'Arcy Short (27 not out) offering valuable support at the other end.
Hampshire in a good position here needing 90 off 66 balls.
Leics 207-3 v Yorkshire 78-3
Image source, Rex FeaturesCallum Parkinson strikes again and this time it's the big one as Joe Root hits a full toss to the fielder at point. No wonder the England Test captain can't believe what he has done.
New batsman Harry Brook takes one from the next ball, but slow left-armer Parkinson now has 3-25 from three overs.
Gary Ballance is 27 not out at the other end.
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Middlesex 174-7 v Surrey 74-1 (7.3 overs)
Middlesex burgle themselves a wicket and a much-needed one too.
Nick Gubbins and his part-time spin induces a loose shot from Will Jacks who picks out Chris Green on the deep mid-wicket boundary.
He was going for his half-century with that shot too!
Northants 43-1 v Lancashire 130-7
Richard Vasconcelos starts the sixth over with back-to-back fours off Danny Lamb. Lancashire have taken one wicket, with Adam Rossington hitting Saqib Mahmood to cover and departing for three, but they are going to need more to keep themselves in this game.
Kent 167-9 v Essex 0-1 (0.2 overs)
Will Buttleman departs to just the second ball of Essex's reply at Chelmsford.
Matt Milnes has him caught behind by Jordan Cox from a thin outside without scoring.
Perfect start for Kent with the ball.
Notts 137-9 (20 overs) v Derbyshire
There were no Samit Patel heroics like in last week's game between these two sides.
Notts have been limited to 137 after he was dismissed for three, with three wickets in a matter of moments by Derbyshire's Mattie McKiernan compounding their difficulties after the innings interval.
The Falcons will need 138 to win.
Middlesex 174-7 v Surrey 65-0
All Surrey so far in this reply at The Oval.
Will Jacks (43 not out) and Jamie Smith (21 not out) going at more than 10 an over in the powerplay with few alarms and some very attractive strokes.
Durham 178-8 v Worcestershire 181-2
Magnificent by Worcestershire skipper Ben Cox, who plays a perfectly executed ramp shot for six off Matty Potts and then off-drives for four to win the match with three balls to spare.
Cox punches the air as the ball reaches the boundary as the Rapids secure their third T20 win of the season and first in five games.
Jake Libby finishes with 78 not out from 55 balls, with Cox making 17 off nine. For Durham, it is their third defeat.
Somerset 172-9 v Hampshire 56-2 (5.4 overs)
Image source, Getty ImagesA stunning setting for the evening at Taunton as Hampshire continue their chase of 173 against Somerset.
Colin de Grandhomme (26 not out) is at the crease for the visitors as they look for a crucial South Group win.
Durham 178-8 v Worcs 170-2
It's a decent penultimate over by Ben Raine, with just six from it. Worcestershire need nine from six balls to win. Are we going to see another tie?
Leics 207-3 v Yorkshire 36-2
Callum Parkinson strikes twice in one over to dent Yorkshire's hopes of chasing down their big target. Jonny Tattersall is caught at backward point for 10 and Adam Lyth goes two balls later for 22, trapped leg-before after missing an attempted sweep shot.
Durham 178-8 v Worcs 164-2
Two overs to go and Worcestershire need another 15 runs for what would be their third T20 win of the season. Jake Libby is 75 not out and Ben Cox has four. Ben Raine will bowl the next one.
Gloucestershire 144-4 (17 overs) v Sussex
Gloucestershire's Glenn Phillips is having a brilliant outing once again.
The New Zealander, who has played an important role in getting his side to top spot in the T20 Blast South Group table, has scored 86 off 50 balls to leave Sussex hoping this innings closes out in a hurry.
Kent 167-9 (20 overs) v Essex
Image source, Rex FeaturesInnings break at Chelmsford.
Kent started off like an express train in their innings but Essex came roaring back with some fantastic outfielding to restrict them to 167-9 in the end.
Zak Crawley (43) and Daniel Bell-Drummond (50) looked like helping them post 230 at one stage.
Jimmy Neesham picks up a couple of wickets in that last over.
Durham 178-8 v Worcs 155-2
Matty Potts starts a new over and Brett D'Oliveira obligingly picks out the fielder at backward square leg from his opening delivery. His dismissal ends a stand of 145 with Jake Libby, who is 70 not out. Ben Cox is the new batsman.
Durham 178-8 v Worcs 155-1
Durham can ill-afford to give runs away at this stage of proceedings, but Ben Stokes is guilty of three wides in his latest over.
Brett D'Oliveira carves a boundary over backward point to push Worcestershire's total past 150. They need 24 from 18.