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
Northants v Lancashire - start 18:30 BST
Lancashire are among the favourites to progress from North group, but have not won in their last three games - defeat, abandonment, tie.
They welcome back pace bowler Saqib Mahmood for his first T20 game of 2021 against a Northants Steelbacks team who finally registered their first win by beating Durham on Wednesday.
Image source, Rex Features
Durham 72-2 v Worcs
Daryl Mitchell comes into the attack with his gentle off-spin. Second ball, Ben Stokes backs away from his stumps and belts it away over long-off for six. The England all-rounder is 10 not out. Eight overs have been bowled.
Durham 65-2 v Worcestershire
An important wicket for the Rapids as David Bedingham attempts a late dab towards third man and feathers a catch to Ben Cox behind the stumps. He hit two sixes and six fours in his 26-ball knock.
Durham 58-1 v Worcs
Image source, Rex FeaturesBen Stokes isn't seeing much of the strike at New Road as David Bedingham continues his assault on the Worcestershire attack. A four through the covers takes the total past 50 and when Charlie Morris bangs one in short, Bedingham puts it away over square leg for six to advance to 38 not out.
Durham 47-1 v Worcs
Looks like David Bedingham is warming to his task.
He follows a boundary at the start of new Dillon Pennington over by pulling the paceman emphatically over mid-wicket for the game's second six.
Another four comes off the next ball and Bedingham has 28 off 17. Ben Stokes picks up his first run from Pennington's final delivery and that is five overs complete.
Durham 30-1 v Worcs
Glorious. David Bedingham takes two short steps down the wicket from his open stance and crashes Ben Dwarshuis over mid-off for four.
The South African has 13 not out but Ben Stokes has yet to score from his first three balls faced.
Durham 20-1 v Worcs
Image source, Rex FeaturesWe praise his strokeplay, Graham Clark departs. 'Twas ever thus.
The final ball of Ben Dwarshuis' opening over is angled across the Durham opener but he doesn't get over his square cut and Brett D'Olivieira takes the catch at point.
Who's next for the visitors? Mr Benjamin Andrew Stokes, no less.
Durham 15-0 v Worcs
They don't hang about, these Durham openers - and that is a very productive opening over.
Graham Clark rocks back to force Jake Libby away for the game's first boundary and then lofts him over mid-off for a maximum, easy as you like.
If Durham keep this scoring rate up, they'll reach 300 - but only the most optimistic north-east cricket fan would expect that to happen.
Durham 0-0 v Worcs
David Bedingham and Graham Clark are proving an effective opening pair for Durham in T20 cricket, with a combined total of 324 runs in their six completed games - one was washed out.
They are out in the middle and Jake Libby is opening the bowling for the Rapids.
As usual, our BBC local radio teams are in place to bring you ball-by-ball coverage of the eight games this evening. Choose a commentary from the audio promos at the top of the page and while you're listening, we'll provide you with regular text updates on the other fixtures.
Image source, Rex FeaturesThe pacesetters in the North and South groups are all away from home this evening.
North leaders Yorkshire - who are unbeaten in five, winning four of them - are taking on revitalised Leicestershire, while closest rivals Notts Outlaws have made the short journey to Derby.
Gloucestershire, leaders in the South, are away to Sussex Sharks - the only unbeaten side left in the competition - and second-placed Kent Spitfires have crossed the Thames Estuary to take on 2019 winners Essex.
Keep an eye on those matches.
Image source, Rex FeaturesUnless you're an Essex Eagles fan, you have to feel a little sorry for Middlesex batsman Stevie Eskinazi, who hit an unbeaten 102 off 61 balls and still finished on the losing side.
They made 183-2 at Lord's but Essex timed their run-chase to perfection, boosted by Dan Lawrence's 59, as Simon Harmer hit the final ball of the game for four to earn his side a two-wicket victory.
There were plenty of runs too at Bristol as Glenn Phillips made 94 not out off ony 41 balls as Gloucestershire totalled 216-2 as they beat Glamorgan by 34 runs.
At Edgbaston, Tom Wood hit an unbeaten 63 for Derbyshire in his first T20 match of the season as they chased down a target of 170 with five balls to spare against Birmingham Bears to win by five wickets.
Worcestershire Rapids v Durham (starts 17:30 BST)
Durham have won the toss and chosen to bat first at New Road.
The visitors are unchanged, while Worcestershire - who have lost three of their last four games, with the other abandoned as a no result - bring in batsman Daryl Mitchell in place of Tom Fell.
The Rapids have a good record against tonight's opponents, but BBC Newcastle's Martin Emmerson is concerned about the weather intervening in this game - listen to his preview below.
Worcestershire: Wessels, D'Oliveira, Libby, Mitchell, Cox, Whiteley, Barnard, Dwarshuis, Sodhi, Pennington, Morris.
Durham: Bedingham, Clark, Stokes, Raine, Bancroft, Dickson, Carse, Eckersley, Trevaskis, Borthwick, Potts.
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Worcestershire Rapids v Durham, Worcester (17:30 BST)
Leicestershire Foxes v Yorkshire Vikings, Leicester (18:30)
Northants Steelbacks v Lancashire Lightning, Northampton (18:30)
Somerset v Hampshire Hawks, Taunton (18:30)
Surrey v Middlesex, Kia Oval (18:30)
Derbyshire Falcons v Notts Outlaws, Derby (19:00)
Essex Eagles v Kent Spitfires, Chelmsford (19:00)
Sussex Sharks v Gloucestershire, Hove (19:00)
Image source, Rex FeaturesThe race for quarter-final places in the T20 Blast is hotting up.
All bar four sides - Sussex, Somerset, Hampshire and Middlesex - have reached or passed the half-way point of their group fixtures, and in the case of Derbyshire, they only have five of their 14 to play.
We have another busy night of action ahead with eight games scheduled.
The first of them starts at 17:30 BST, so welcome to our coverage.
Image source, Rex FeaturesClick on fixture to see full scorecard
T20 Blast
Worcestershire Rapids v Durham (17:30 BST) - BBC Radio Hereford & Worcester
Leicestershire Foxes v Yorkshire Vikings (18:30 BST) - BBC Radio Leicester
Northamptonshire Steelbacks v Lancashire Lightning (18:30 BST) - BBC Radio Northampton
Somerset v Hampshire Hawks (18:30 BST) - BBC Radio Solent & BBC Radio Bristol
Surrey v Middlesex (18:30 BST) - BBC Radio London
Derbyshire Falcons v Notts Outlaws (19:00 BST) - BBC Radio Derby & BBC Radio Nottingham
Essex Eagles v Kent Spitfires (19:00 BST) - BBC Radio Kent
Sussex Sharks v Gloucestershire (19:00 BST) - BBC Radio Sussex