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Kumar Sangakkara keeps on ticking here for Surrey as he hits Moeen Ali over the offside infield for four.

Nicely opened the face to that to exploit the gap.

Ben Cox whips off the bails for an attempted stumping as a beauty from Moeen beats his outside edge. Not out the decision as his back foot barely moved.

Tries to smash Moeen over long-on off the last ball, but it drops short of the fielder and that's another single to the Sri Lankan.

John Hastings back on to bowl after his first three overs cost 34 runs. There's little respite on his return as Ben Foakes glances a beautiful shot for four more.

Digs one in short to Kumar Sangakkara, which he pulls away for a single to leg.

Daryl Mitchell's last over sees him comprehensively pulled away for four by Kumar Sangakkara, one bounce over the rope.

Mitchell finishes with figures of 1-59 from his 10 overs. He's played his part in keeping Surrey in check in this innings so far.

Moeen Ali was back on to bowl in that over where Kumar Sangakkara passed 50.

Another tidy over from the England off-spinner with just three runs conceded.

50 for Kumar Sangakkarapublished at 34.4 overs

34.4 overs

Surrey 226-3 (Sangakkara 50, Foakes 32)

Kumar Sangakkara is a joy to watch when in full flow. He has 50 on the board off 55 balls.

Below are the video clips of the two sixes he has hit in his innings alongside a couple of fours.

Three wickets down for Surrey, but if Sangakkara stays at the crease for the foreseeable future the total could be a daunting one.

Four once more from Ben Foakes, off Daryl Mitchell this time, strong pull shot dismissed away to the fence.

The Surrey wicket-keeper is motoring along here and looking in great touch as he works the ball around off the rest of that over.

Stuart Vaughan: Can't believe people saying Roy back in form, sat at the ground watching he had more lives than a cat.

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Some great fielding in the deep by Worcestershire's Ross Whiteley to back up the good work of the bowlers.

Cuts off a certain four for Ben Foakes on the legside with a massive diving stop.

Foakes does get a four at the second attempt though with a lovely drive through extra cover and then the next ball, a similar stroke just a bit wider, gets him four more.

More tight, containing stuff from Daryl Mitchell. Three off that over and Surrey just struggling to break the shackles at this point.

Brett D'Oliveira's fine delivery saw the end of Rory Burns and has slowed the pace somewhat for Surrey.

Worcestershire are fighting back, but with only three wickets down and plenty of time, a mammoth total is still on the cards.

200 up for Surrey but just four singles from Brett D'Oliveira's sixth over.

The leg spinner has 1-27 from this spell so far.

More tidy stuff from Daryl Mitchell with his medium-pacers. His seven overs have yielded 1-41 so far.

Good restricting stuff from Worcestershire to keep Surrey under control.

20 overs to go.

First boundary in a while for Surrey comes from the bat of Ben Foakes. Nice low pull shot for four off Brett D'Oliveira.

That takes Foakes past 400 runs in this competition this season in nine games.

Another tight over from Daryl Mitchell, just two runs from it.

Surrey 24-2 off the past five overs as the runs have been squeezed by the hosts.

Top over there from Brett D'Oliveira and the home crowd are full of appreciation with some hearty applause.

Ben Foakes is the new man in at five for Surrey and he's off the mark with a single.

Tony Bickley: Decent knock for Jason Roy today. Proving he can bat and perhaps was just unlucky for England!

Ebony Rainford-Brent
Ex-England batter on BBC Radio 5 live sports extra

A good ball from Daryl Mitchell just now to dismiss Jason Roy, he came a little bit wider, just angled it in.

Jason Roy wasn't going for any big shot, I think he lost a bit of balance in the shot which was unfortunate but well done to Roy for finding some form.

To me that's a brilliant return.

Daryl Mitchell unlucky not to have a second wicket in that over.

Rory Burns is off and running with a streaky outside edge for four down to third man.