Postpublished at 14:49 Greenwich Mean Time 22 January 2016
Michael Vaughan
Ex-England captain on BBC Test Match Special
"Duminy has got a real problem against off-spin."
Cook hits 115 on South Africa debut
Amla 109 - adds 202 with Cook
Bavuma 32*, De Kock 25* from 274-5
Two wickets for Moeen
England lead 2-0 in four-match series
James Gheerbrant and Stephan Shemilt
Michael Vaughan
Ex-England captain on BBC Test Match Special
"Duminy has got a real problem against off-spin."
Change-up after drinks - Moeen Ali to bowl to some off-spin, and his first ball is an absolute doozy: bit of drift in, and sharp turn past the outside edge of Duminy. Still, as seasoned observers of Moeen will know, as sure as night follows day, a bad ball will follow his good one. Sure enough, a rank beamer slips out of the hand and is dispatched to the boundary by Duminy.
Michael Vaughan
Ex-England captain on BBC Test Match Special
"The pitch might get a bit quicker tomorrow. That is why South Africa have to make it count - they need to get 400 on here."
SA 251-3
Is it just me, or when commentators talk about bowlers 'slipping themselves', does anyone else think they've done themselves an injury? Sounds painful to me. Anyway, Anderson sends down a maiden to Cook, and it's time for drinks.
Michael Vaughan
Ex-England captain on BBC Test Match Special
"South Africa have got to be positive and make sure the scoreboard keeps ticking on. If you add two wickets to the score now, it is a good turnaround from where it was."
Duminy - who is coming off an unbeaten 260 in South African first-class cricket - gets off the mark with a bash through the covers for four.
Michael Vaughan
Ex-England captain on BBC Test Match Special
"They have just bowled better areas in the session. They have been more consistent and they have bowled into the surface. Broad has been the stand-out."
Cook blocks out a maiden to Anderson.
Simon Mann
BBC Test Match Special
"Cook has looked the part today, he really has."
It would be fair to say that getting a debut hundred isn't exactly a guarantee of future success. Adrian Barath, Hamish Rutherford and Stiaan van Zyl are some of the less illustrious recent names on the list. But Cook really has looked the real deal. He punches one through the covers, Duminy remains stuck on nought.
#bbccricket
Karl Reynolds: Surely I'm not the only one that noticed it's a century of debut century makers and it's come at Centurion?
Good spot Karl!
Cook, now loosened up, flays a four through midwicket on the pull. Meanwhile, up the other end, the new man is JP Duminy, who is back in the side after being dropped mid-series and then making a double ton for his franchise side. He blocks out his first two balls.
So, Stephen Cook becomes the 100th man to score a hundred on Test debut, and the fourth-oldest. Brilliant achievement. Could he enjoy a Chris Rogers-style Indian summer in the Test side? We shall see.
Henry Blofeld
BBC Test Match Special
"A tremendous effort. The pressure that was on him at the end. Well, well, well what can you say? Well Done Stephen Cook."
Geoffrey Boycott
Ex-England batsman on BBC Test Match Special
"That was splendid. He played beautifully up to 90 then it was agonising. It just shows that so much of the game is in the head."
SA 240-3
He's done it! What a great moment for Stephen Cook, an hour in the 90s but finally the 33-year-old who thought his chance would never come gets one on his pads and glances it into the leg side for two. The boyhood dream is finally realised.
Lovely scenes in the stands as three generations of the Cook family - father Jimmy, and Stephen's wife and daughter - join in the rapturous applause. Well played sir.