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 15-1 (3 overs)
James Vince departs at the start of Hampshire's pursuit of 173 at Taunton.
Craig Overton rearranges his stumps with a ball he tries to pull but didn't look like it bounces as much as he was expecting.
Northants 12-0 v Lancashire 130-7
No need for the Steelbacks fo go hell for leather from the off here, but Ricardo Vasconcelos found the boundary in Saqib Mahmood's opening over. He is 11 not out and Adam Rossington has one.
Middlesex 174-7 v Surrey 24-0 (2 overs)
Will Jacks is not hanging around for Surrey here at The Oval.
The opener crashes a couple of big boundaries off Blake Cullen, including a huge six over deep mid-wicket into the stands.
Leics 207-3 v Yorkshire 21-0
Yorkshire have made a positive start at Grace Road and they certainly needed one. Adam Lyth hits Colin Ackermann down the ground for six and has 17 from eight balls faced at the end of the second over.
Notts 103-8 (15 overs) Derbyshire
Another frustrating few minutes from a Notts' perspective.
But you have to credit Mattie McKiernan for taking three wickets in quick succession.
First, his delivery sees Tom Moores caught in the deep by Falcons' Tom Wood for 17, before Calvin Harrison is bowled out without scoring, and Luke Fletcher is caught for two.
Durham 178-8 v Worcs 142-1
Great stuff by Brett D'Oliveira, who cross-bats the first ball of a new Scott Borthwick over through the covers for four and pulls the next to the boundary on the other side of the ground. He advances to 61 not out, Jake Libby has 67, and the Rapids need 36 from the last four overs to win.
Kent 155-6 (17.3 overs) v Essex
Essex get the Kent danger man just as he threatens to cut loose in the closing overs.
Darren Stevens holes out to Dan Lawrence on the square leg boundary off Simon Harmer and then Jordan Cox falls the very next ball to the same fielder as Kent's innings continues to stutter after a fast start.
Durham 178-8 v Worcestershire 131-1
Brett D'Oliveira's 50 apart, that wasn't a bad over for Durham, costing Brydon Carse only six runs. The Rapids need 47 from 30 balls to win this one - we could be in for a close finish.
173 and 175 are the respective targets for Hampshire and Surrey at Taunton and The Oval as their innings begin.
Could be a couple of tight matches here in the South group.
Kent 143-5 (16.4 overs) v Essex
Image source, Rex FeaturesDarren Stevens often proves to be a thorn in Essex's side.
The 45-year-old's found the boundary a couple of times already with 22 off 17 balls to try and get Kent up to an imposing score in these closing overs.
Durham 178-8 v Worcs 128-1
Brett D'Oliveira follows his partner to 50 with a single off Brydon Carse. It has taken him 38 balls and included two sixes and three fours. The stand with Jake Libby is now worth 118.
Durham 178-8 v Worcs 114-1
Image source, Rex FeaturesJake Libby reaches his fifth T20 half-century and what a way to do it - by pulling a ball from Ben Stokes for six over mid-wicket. It wasn't the most elegant of strokes, but he won't care a jot about that.
It took Libby just 33 deliveries to reach 50 and he celebrates by gloving the next past the despairing Durham keeper and down to fine leg for four.
Worcestershire need 61 to win from the last seven overs.
Northants v Lancashire 130-7 - end of innings
Lancashire add seven to their total from the final over at Wantage Road, but Northants will be hopeful of a second successive win.
Steven Croft finishes on 35 not out, with Luke Wood the last man to go, run out by Ben Sanderson at the end of the penultimate over.
He failed to get hold of a full toss but set off for a single more in hope than expectation and bowler Sanderson was able to gather the ball and saunter to the other end to run him out.
Image source, Getty ImagesInnings intervals at both The Oval and Taunton.
Half-centuries from Stevie Eskinazi and Daryl Mitchell helped Middlesex recover from 10-2 early on to finish on 174-7.
Somerset meanwhile have made 172-9 against Hampshire with Tom Banton making 77 and Will Smeed (pictured above) 63 not out.
Leics 207-3 v Yorkshire - end of innings
Unlucky, Arron Lilley, who can only manage a single from the final ball of Leicestershire's innings and finishes 99 not out from 55 deliveries faced.
It's the best T20 score of his career, though, and he hit four sixes and nine fours during his innings.
It's the third time the Foxes have passed 200 in the 2021 Blast - and second time against Yorkshire.
Notts 81-5 (10 overs) v Derbyshire
At Trent Bridge last week, Notts' Samit Patel hit 64 not out, then claimed two scalps as he became the first Englishman to do the T20 double of 250 wickets and 5,000 runs.
But tonight, Derbyshire have their revenge and the former England international is out after being caught lbw by Matt Critchley for three.
Joe Clarke managed 36 runs before being caught by Tom Wood, with Ben Duckett and Sol Budinger the other wickets taken.
Durham 178-8 v Worcs 88-1
Worcestershire reach the half-way point of their innings and need another 90 to win from 60 balls. Jake Libby is 42 not out after swatting a ball from Brydon Carse to the long-on boundary and Brett D'Oliveira has 36. They have put on 79 so far.
Northants v Lancashire 112-6
More great fielding by Northants as Tom Taylor dives to catch Danny Lamb for 20 at mid-off. It's a second wicket for Wayne Parnell, who has 2-22. There are two and a bit overs left as Luke Wood comes to the crease.
Kent 104-4 (11.1 overs) v Essex
Image source, Rex FeaturesA half-century and out for Kent skipper Daniel Bell-Drummond at Chelmsford as Essex continue to check the Spitfires' fast scoring with regular wickets.
Essex captain Simon Harmer takes a brilliant full-stretch diving catch in the deep off Dan Lawrence to dismiss Bell-Drummond a ball after he reached 50 from just 28 balls with five fours and two sixes.
Leics 191-3 v Yorkshire
There are two overs left in the Leicestershire innings after Colin Ackermann is bowled for 40 by a slower ball from Matt Fisher. He put on 90 with Arron Lilley, who is still there on 85 not out. Rishi Patel is the new batsman.