Stuart Owens: Don't judge Alex Hales on a tour of SA. Do so after a few Tests in England. Changing every two minutes isn't helping.

Anthony Hall: I forget why Compton isn't opening the batting. Am I missing something here?

Peter Collins: Is Hales the perfect Test opener? Of course not. Is he one of the better options? Yes. So can we just leave him there a bit?

Three off that Morris over, a nicely-timed clip off the legs from Cook. A little bit of movement off the pitch for the bowlers.  

Compton stares back down the wicket deep in concentration after seeing off three dot balls. He looks intense. 

What's going on here? The pitch is playing as it was when England were bowling, but suddenly the ball is plugging in the outfield. Alastair Cook pulls Kagiso Rabada towards the boundary but he only gets three for his efforts.

With England under the pump, we need to turn to a safe pair of hands to guide us safely through the rest of the morning session. Here's Tim Peach.

Dave: I think England will probably reach the follow-on target. Not expecting anything over 200 though.

In five Test innings, Alex Hales has a batting strike-rate of 36.17. Nick Compton, in 22 knocks, scores his runs at 35 per 100 balls. Make of that what you will, but it suggests Hales is not playing his natural, attacking game?

Or maybe he is and that's why he just nicked off to first slip?

Andrew Samson
BBC Test Match Special statistician

"Morris, Rabada and Viljoen all play their domestic cricket for the Lions. Last season, they played six games together, the Lions won five and the trio took 90 wickets at 19.9 between the three of them."

Francis Edwards: As exciting as he is in one day and T20 cricket, we've learnt that Hales is not a Test opener. The search goes on.

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

"It was the perfect length. Fuller, Hales was caught in the crease and he threw he hands at the ball. Rabada got everything perfect and reaped the rewards."

Pakistan bowler Mohammad Amir took 1-31 from his four overs on his return to the Pakistan side after a five-year ban for spot-fixing.

The left-arm seamer, 23, also had two catches dropped but took the wicket of Matt Henry as Pakistan beat New Zealand by 16 runs in the opening Twenty20 international at Eden Park in Auckland.

The visitors made 171-8 and New Zealand were all out on the final ball of their innings for 155.

Scorecard

Image source, AFP

Alex Hales doesn't seem to have mastered the art of soft hands in the manner somebody like Dean Elgar clearly has... the right-hander lucky to see an edge hit the turf before scuttling through the slip cordon. Testing times.

Graeme Smith
Ex-South Africa captain on BBC Test Match Special

"Cook looks like he has developed some technical problems. He's very deep in his crease. South Africa have to bowl full to try and expose the doubt that these problems have caused."

Alastair Cook's a liar if he says his heart didn't skip a beat when he turned Kagiso Rabada round the corner and watched with relief as the ball dropped well short of the fielder at backward square leg.

The over ends with Cook being squared up and the ball flies through the off side for three more runs. The skipper's looking a bit nervy early on.

Image source, Getty Images

Jem Peel: And - right on time - 'severe thunder storm' warning in Jo'burg. You can't tell me that SA don't have a weather machine!

Kagiso Rabada, who has dismissed Alastair Cook twice for just 10 runs already in this series, shares the new ball ahead of Morne Morkel.

Andrew Samson
BBC Test Match Special statistician

"Ben Stokes took his 50th wicket in his 22nd Test, having reached already reached 1,000 runs. Ian Botham took 21 Tests to do that double. The record is 15 matches by South Africa's Aubrey Faulkner, who played in the early 1900s."

A nice nerve-settling two for Alastair Cook gets England up and running. Interesting that Cook is facing first - he always used to let Adam Lyth take the first ball. Alex Hales must have chosen not to. 

Chris Morris takes a few balls to find his radar, then delivers a jaffa which pitches on middle and nips in, hitting a jumping Cook in the groin area on its way through to the keeper.

• South Africa's total of 313 is the lowest in Test history when every batsmen has reached double figures
• It is also the first time that all 11 batsmen have reached double figures but none have made a half-century

Chris Morris has the new ball in hand. Let's play.

Chad Clifton: That arm-wrestler idea has legs, imagine if each team picks the wrestler from the other team though! Poor Root! 

Harry Sturley: No offence to Steve Finn but I'd definitely go with Ben Stokes for the arm wrestle.