Surrey very much on top here after four overs.

A wicket apiece for Dan Worrall and Reece Topley.

Can skipper Alex Lees and Colin Ackermann put together a partnership here?

Durham certainly need them to.

Dan Whiting
BBC Radio London

There's been decent carry here at the Oval all year.

Rory Burns is stood a long way back keeping to Reece Topley.

We are in a perfect position here right behind the bowler's arm.

A BIG old swing and a miss from Ollie Robinson off Reece Topley's delivery.

Luckily for him it goes over, rather than into the stumps.

Robinson tries to get Topley away again next ball but again he is unable.

It's a slow start from Durham.

Ollie Robinson finally gets off the mark with his seventh ball and Alex Lees will face the last ball of the over...

It's another beauty from Worrall and Lees won't be scoring off that one.

Surrey's Dan Worrall is back on for his second over and he's already causing problems!

A ball rasps back into Alex Lees' body but scuttles away for four leg byes to take the visitors into double figures.

The lbw shouts go up from a Reece Topley ball which hits Ollie Robinson on the pads but nothing doing from the umpire.

Another dot ball ends the over with Durham 6-1.

The first over definitely went in Surrey' favour with Durham 1-1, but Alex Lees has just struck the first boundary with the second ball of the second over.

England left-armer Reece Topley is the man now steaming in for Surrey.

Dan Worrall's first three ball all beat the bat and slide straight on through behind.

Graham Clark yet to get off the mark but Worrall's fourth ball is a wide so at least Durham have a run now!

Martin Emmerson
BBC Radio Newcastle

You look at that Surrey team, it has so much international experience in there.

It's the England A and B team all rolled into one.

Nine of the Surrey 11 have played for their country!

It'll be Graham Clark and Alex Lees opening the batting for the visitors from the north east of England.

Dan Worrall to bowl the first over.

Here come the teams amid a fair few fireworks!

Lovely evening at the Oval and we're almost ready for the action to start.

I saw some quotes before the game in which Durham head coach Ryan Campbell described facing Surrey as "a free hit".

"There is an expectation that Surrey are the best team, but we have the belief inside our walls and that is very clear to see and we won’t take a backward step and that is what I love about this group," he told the club website.

Whether it's taking pressure off his own players or talking up Surrey's quality in the hope some complacency might slip in, might it help underdogs Durham have their day?

Image source, Rex Features

Durham are among the teams to have never won the T20 Blast.

They have made it to Finals Day twice - in 2008 when they lost in the semi-finals - and their best performance in the competition came in 2016 when they reached the final but finished as runners-up to Northants.

Durham finished fourth in this year's North Group, winning seven of their 14 matches, to pip Leicestershire to a spot in the quarters.

Image source, Getty Images

For all their red ball domination in recent times, Surrey have not been able to gain the same level of superiority in the white ball game.

After winning the first T20 Blast in 2003 Surrey have not got their hands on the trophy again despite several appearances at Finals Day - including last year when they were knocked out in the semi-finals.

This year, they topped the South Group of the competition with nine wins from 14 matches and have the sort of strong squad to choose from that should put them in consideration for a serious tilt at that elusive second title.

Surrey have won the toss and Chris Jordan has decided to have a bowl.

Surrey XI: Jacks, Sibley, Evans, Burns (wk), S Curran, J Overton, T Curran, Clark, Jordan (c), Topley, Worrall.

Durham XI: Clark, Jones, Lees (c), Ackermann, Turner, Robinson (wk), De Leede, Carse, Raine, Sowter, C Parkinson.

The four T20 Blast quarter-finals are being held over the next four days as eight teams battle for a place at Finals Day at Edgbaston on Saturday 14 September.

Here's this week's full line-up -

• Kia Oval: Surrey v Durham (18:00 BST, Tuesday)
• Hove: Sussex Sharks v Lancashire Lightning (19:00, Wednesday)
• Northampton: Northamptonshire Steelbacks v Somerset (Thursday, 18:30)
• Edgbaston: Birmingham Bears v Gloucestershire (Friday, 19:00)

You can follow ball-by-ball action of every one of them through our live text coverage, as well as BBC radio commentary which is available at the top of the page.

Good evening and welcome along to our live coverage of the first of this season's T20 Blast quarter-finals.

We have a cracker in store to kick things off as Surrey host Durham at The Kia Oval.

It's been more than six weeks since the group stage was completed in mid-July and here we find ourselves in early September so if you aren't entirely au fait with how the last eight are lining up, do not despair, we'll get you up to speed in a jiffy.

Image source, Getty Images