Watch: Hales reaches his half-centurypublished at 15:16 British Summer Time 24 May 2017
Watch the moment Alex Hales brings up his fifty.
Four wickets for Woakes, two each for Moeen & Rashid
South Africa lose seven wickets in 14.3 overs from 145-1
Amla (73) and Du Plessis (67) out in successive overs after stand of 112
Eng 339-6: Morgan 107 (93), Moeen 77* (51)
First game of a three-match series
Listen to TMS at the top of this page
Amy Lofthouse
Watch the moment Alex Hales brings up his fifty.
Eng 90-1
Absolutely glorious weather at Headingley today, courtesy of this snap from Alex Crossley.
Vic Marks
Ex-England spinner on BBC Test Match Special
Hales has made 50 from 52 balls but has barely opened his shoulders. He's got all the big shots, but he hasn't been extravagant yet.
Andy Zaltzman
Comedian & BBC Test Match Special statistician
In Alex Hales' first 20 innings in ODIs he averaged 20.9. Since then, he's played 22 innings and averaged 58.7.
Hales 51, Root 30
Morris mixes up his lines, bowling straight before rounding off the over with a short ball. Hales opens his arms and swings, but Amla down on the boundary cuts it off for a single. Time for a drinks break.
Eng 89-1
Hales drops a Morris delivery away, takes a run and then raises his bat to the Western Terrace as he brings up his half century. That's come along from 52 deliveries. He's not looked awfully troubled either, just merrily ticking along at a run-a-ball.
Vic Marks
Ex-England spinner on BBC Test Match Special
Tahir has been the most economical and the most dangerous. The only problem England have is knowing what a good score is. It probably starts with a three, but 310 won't be invincible.
Tahir varies his pace up nicely, keeping the batsmen on the back foot. Root jumps on the quicker ball though, flicking it disdainfully off his pads and down the hill for another couple.
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Ruth Brooksbank: Perfect weather for cricket and (almost) perfect start for England, let's hope it's an England run-fest.
Pitched Outside Leg: England's batting without Bairstow is actually an anagram of his name. As they'd say in Yorkshire it's " a bit wors' ".
Root, who got off to a flying start, has quietened down in the last few overs, and he works a run here and another there from Morris. Hales toe-ends a slower ball from Morris, and the ball rolls through the vacant slip area for a boundary, which Morris looks thrilled at.
No-one ever gets caught there - watch as Ales Hales top-edges one behind for four off Chris Morris.
Right then. Have you ever failed to spot a cricketer? Been shopping alongside Ben Stokes and not noticed until it's too late? Get your stories coming in.
Jonathan Agnew
BBC Test Match Special
I failed to spot JP Duminy on Question of Sport. Now, I can't look at him without feeling embarrassed. Tuffers always teases me about it.
Root 24, Hales 41
It's beautifully sunny at Headingley as Tahir whirls through another offer. Root thumps his bat on the pitch in annoyance as he misses out on a low full toss, before Hales taps away another single.
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John Robertson: Bairstow doesn't even compare to Roy and Buttler. There's a reason he wasn't bought in the IPL and they were.
Ross Brown: Fans calling for Jason Roy to be dropped clearly dont remember that he has been one of the catalysts for our turnaround in ODIs
Ooft, that's nice from Hales, a drive that beats De Villiers and runs away down the hill for four. Morris responds with a bouncer that Hales hoicks at like he's swatting a fly, and gets another boundary off a top edge. Morris looks a tad irked.
Michael Vaughan
Ex-England captain on BBC Test Match Special
Tahir doesn't spin his leg-break that much. It's the googly and faster one that causes the surprise.
Ten overs gone, which means its time for Imran Tahir. It's a nice, tidy over to start off with, Hales misreading the wrong 'un before he knocks the final ball away for a single.
Michael Vaughan
Ex-England captain on BBC Test Match Special
De Villiers, when he won the toss, wouldn't have been thinking that they would bowl England out for 260. He'll know 300 is par and he'll back his batting power to chase it down.
It's beautifully sunny. Jonny Bairstow, watching in the stands, has turned an interesting shade of magenta. Chris Morris swipes at his brow and yelps as Root, trying to work his wrists on a straight delivery, sends a leading edge down towards a diving fielder. That'll be a maiden.