Hang on - he's out. Du Plessis has a huge swing, gets an edge and the ball somehow lodges in the webbing of Ramdin's glove. The keeper looks amazed and stares at the ball in his hands, then belatedly celebrates. Wicket for Gayle. Du Plessis is gone.

Cracking shot from Du Plessis, leaning back and spooning over extra cover for a one-bounce four. This is following a very similar pattern to the Sri Lanka innings yesterday...

Now then, time for Chris Gayle to turn his arm over a bit. I think he's a better bowler than people give him credit for. It's a gentle set of six and the South Africans are happy to tickle ones and twos.

Graeme Swann
Ex-England spinner on BBC Test Match Special

"I don't really understand South Africa's reticence to score at all in the first 10. It was Test match style. Now they have changed it up and are scoring freely. I just think they have missed a trick and are 30 or 40 short of where they should be."

Image source, AP

The batsmen had a chat between overs. I think it's time to move up yet another gear. Faf Du Plessis completes his fifty off 59 balls with a pull for four. Nine runs from the over. Lots and lots of batting to come remember.

Thank you Phil for that invigorating stint. I'm Sam Sheringham and I'll be seeing this innings to the end.

Hashim Amla's six was clearly a declaration of intent and he has another big swing at Benn and gets a thick outside edge for two. That's the 100 partnership between these two.

Darren Sammy brings the innings to its halfway point with his fourth over. It is an over that contains the innings' first six, which Amla smashes back down the ground to bring up his 50 (his 28th in ODIs). He adds to that with two from the last ball, via a chip to the leg side.

South Africa's 100 come sup courtesy of a flick through mid-on for one from Amla. The foundations continue to be laid by the South African pair in the form of five singles, the last of which came from an Amla smash down the track that almost takes his partner's head off at the non-striker's end.

Barry Richards
Ex-South Africa batsman on BBC Test Match Special

"It's nip and tuck at the moment. it's almost like a boxing match with the two teams circling around it each. South Africa will be very pleased to have only lost one wicket, the West Indies will be happy to have kept the run rate down. It's going to be a good contest."

Kalika Mehta
BBC Sport in Sydney

"A couple of fours bring the crowd to their feet and the South African flags in the Bill O'Riley and the Victor Trumper are being waved furiously.

"The loudest cheer from this relatively paltry crowd thus far was reserved for Sulieman Benn when he used his foot to stop the ball from reaching the boundary. The pre-match football warm-up seems to have come to fruition for the towering West Indian."

Amla is battling hard and slashing the ball away for singles but his timing is not quite there. But as long as he is at the crease and keeping the runs coming (albeit slowly), South Africa are well-placed to accelerate later in the innings. They have plenty of firepower in the tent. Sammy's third over goes for three singles.

Benn concedes a couple of singles in his first two balls before almost sneaking through Du Plessis' defence with one that is just short of a length. Du Plessis responds by dancing down to the next and hammering one back at the bowler for a catching chance that beats him for pace and is dropped. That would have been a timely blow for the West Indies, who started superbly but could do with another wicket now.

South Africa 90-1 (21 overs)

Not out batsmen: Amla 40, Du Plessis 33

Fall of wickets: 18-1 (De Kock 12)

Bowling figures: Taylor 5-1-20-0, Holder 5-2-9-1, Russell 4-0-23-0, Samuels 1-0-5-0, Benn 4-0-21-0, Sammy 2-0-10-0

South Africa won toss

Scorecard

Listen to Test Match Special commentary

There is greater intent about Amla now, who is foiled by the fielder at mid-off with a flashing drive before a nudge to the leg side brings him one. Du Plessis quickly hands the strike back to his partner, but Sammy ties him up with a full, straight delivery.

A small committee meeting between the umpires and the West Indies captain ahead of the 20th over appears to be to discuss the state of the ball. Benn is handed it again and is worked around nicely by the SA pair for four singles.

South Africa may not be blasting boundaries with regularity but they are turning dot balls into singles and ones into twos now. It helps that these two are pretty pacey between the stumps. Darren Sammy is the new West Indies bowler and almost ends his over with a wicket by catching the outside edge of Du Plessis bat. No slip means South Africa pick up two more runs.

Barry Richards
Ex-South Africa batsman on BBC Test Match Special

"The tide is turning just a little bit. I think Hashim Amla has made the decision to bat all the way through. There will come a stage where one of these batsmen will attack a lot more. They need to get a good foundation and set the scene for AB De Villiers."

The gangly figure of Benn ambles in for another over of spin and he catches the outside edge of Amla's bat with his fourth delivery but it is a thick enough one to take it past the keeper and down to third man for two. He then belts one to long-on to keep the strike.

Andre Russell resumes with a bouncer that the umpire adjudges to be a wide. It is fair to say the bowler does not agree. Du Plessis drives one through mid-on for two before picking up another single with a steer from a short ball.

Andrew Samson
BBC Test Match Special statistician

"South Africa's compulsory power play scores in this tournament: 28-2 v Zim, 38-1 v Ind, 30-1 today. Their average of 32 runs in the compulsory power plays is the lowest of any team in the tournament to date."