Down at the Ageas Bowl, two sides who'll be hoping to progress to the top division next week in the County Championship come into this Blast group match in very differing form.

Hampshire are bottom of the South Group having won just twice in 10 games while Somerset sit third just a point off the top.

Hampshire have won the toss and elected to bat first as Chris Wood captains in the absence of James Vince on England duty.

Somerset still look strong contenders even without Craig Overton and Lewis Gregory in their ranks.

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Worcestershire end up with 13 runs off the final over, posting 174-6 from their 20 overs.

Ben Cox swings the bat at a couple to get a six and then a four with a thick outside edge.

Then he holes out to Sam Hain at long on and goes for 43.

That means Will Rhodes ends with career-best T20 figures of 4-34.

But the Rapids still have a decent total to defend after a solid innings.

Surrey are finding it tough going in the powerplay, as Joe Denly and Adam Milne start off with some tight bowling.

Jamie Smith is the man out, for 1.

It's been the worst possible start for Northants, with openers Ben Curran and Ricardo Vasconcelos both picking out fielders in the opening two overs.

Curran struck Steven Croft straight to long-off, Alex Davies catching with ease, with Vasconcelos attempting a sweep off Tom Hartley and being caught in the deep.

Lancashire lost the toss but have started very well.

Four games were meant to start at 18:30 BST but as it happens only two get under way on time.

Northants are batting first at Lancashire, with Surrey also up and running with the bat against Kent.

However there's rain at Nottingham and Durham, meaning the start is delayed between Notts Outlaws and Yorkshire and Durham and Derbyshire.

Durham may well have been shorn of a couple key names after England were forced to rename their ODI squad for the series with Pakistan, but they know they still have a task on their hands if they want to maintain hopes of reaching the last eight.

They begin the evening in fourth place in the North Group against a Derbyshire side bottom of the pile.

The visitors have won the toss and elected to bat first.

Paul van Meekeren and Luke Doneathy are handed their Durham debuts while Brydon Carse and a certain Ben Stokes are otherwise engaged.

Durham: Bedingham, Clark, Raine, Bancroft (capt), Dickson, Eckersley (wk), Potts, Borthwick, Crawshaw, Van Meekeren, Doneathy.

Derbyshire: Reece, Came, Wood, Du Plooy, Critchley (capt), Guest (wk), Hudson-Prentice, Thomson, Van Beek, Dernbach, Scrimshaw.

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Worcestershire lose Ross Whiteley to the penultimate ball of the 15th over, as his off stump is removed by Ryan Sidebottom.

Ed Barnard grabs a couple to get off the mark, and Ben Cox is 19 not out.

The Rapids need to push on in the final five overs, with six wickets in hand.

It’s a top-of-the-table extravaganza in the North Group, with leaders and reigning champions Notts Outlaws able to guarantee a home quarter-final with victory at Trent Bridge.

The Green and Golds have won seven of their 11 T20 Blast games this season and have sold all their permitted tickets for this one.

Second-placed Yorkshire are likely to join them in the last eight but will be looking to improve on their record of just one win from four away games in this year’s competition.

The bad news... it's started to rain in Nottingham!

Lancashire are down in sixth in the North Group after a frustrating campaign so far, but are only one point from a qualification spot with all three of their remaining games on home soil.

They start a point ahead of Northants, who failed to win any of their first six T20 Blast matches but have since won four of their past five to retain hopes of reaching the knockout stages.

The Steelbacks triumphed by seven wickets when the teams met at Wantage Road just two weeks ago.

An unchanged Northants have won the toss and elected to bat.

South Group leaders Kent have been in fine form, winning seven of their 11 matches so far.

The Spitfires beat Surrey by 11 runs when these two teams met in Canterbury a week ago, courtesy of Adam Milne's hat-trick from the final three balls of the innings.

Kent have a one-point lead at the top of the table, and are two points ahead of the hosts. The visitors have won the toss and will field.

Surrey were runners-up in the Blast last year and will have the backing of a vocal Kia Oval crowd as they look for a second win in three T20 outings.

England's ODI Covid issues have deprived Surrey of Will Jacks and Kent of Sam Billings and Zak Crawley.

Singapore international Tim David, a right-handed batsman, makes his debut for the hosts.

Yorkshire have won the toss at Trent Bridge and will bat first.

Batsman Sam Northeast makes his T20 Blast debut for the Vikings, who are without Joe Root, Jonny Bairstow, Adil Rashid and David Willey (isolating), as well as Dawid Malan, who was called up to the replacement England squad.

Notts Outlaws have Ben Duckett and Jake Ball away on international duty but opener Alex Hales is in the squad after signing a new two-year white-ball deal this week.

Notts Outlaws: Hales, Slater, Trego, Moores w, Patel, Mullaney (capt), James, Fletcher, Harrison, Carter. Paterson.

Yorkshire Vikings: Lyth (capt), Northeast, Thompson, Ballance, Brook, Hill, Waite, Duke w, Fisher, Bess, Poysden.

The hosts are scooting along at just over nine an over midway through the innings.

Jake Libby and Ben Cox are getting their eye in.

Can they set an imposing target to defend?

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Worcestershire are motoring along at New Road, scoring at over 10 an over for their best powerplay this season.

Ryan Sidebottom looked to be checking the Rapids momentum in the fifth over, but then Brett D'Oliveira smashes a six back down the ground before ending the over with a ramp shot to a full toss which ran away for four.

Spinner Ryan Yates is milked in the final over of the powerplay, going for 13.

Riki Wessels is unbeaten on 34, with D'Oliveira 29 not out.