Shah shows value for England
Promoted to number three by Kevin Pietersen, Shah had missed out in his two previous innings, scoring 12 and 23 when he had ample time to set himself.
Perhaps it was the freedom that came with the 20 overs chase that relaxed him at Lord's, and also Pietersen's blistering 40 from 32 balls at the other end, and he played exactly the clever, well-paced innings that England want from their number three.
He hit some big shots, of course, but Shah's real strength is, thanks to his flexible wrists, the ability to manoeuvre the ball into gaps and run aggressively.
This has been an area of weakness in England's approach in recent years, and apart from getting the scoreboard moving without taking risks, sharp, positive running really winds up the opposition.
At 29, Shah is approaching the age of make or break at the shortened form of the game, but another sensible display at Cardiff in the final match of the series will earn him the benefit not only of the Stanford bonanza in Antigua, but also an extended run at number three in the seven-match series in India before Christmas.
The whitewash remains very much on the cards following another dispirited performance by South Africa. They now look a very sorry bunch indeed and must be mighty relieved that the Champions Trophy, which should have followed hard on the heels of this tournament, has been postponed.
England, on the other hand, would love to maintain the momentum that they are now building at such a rapid pace.
Their attitude at Lord's was commendable, as they had to face very fast bowling in near darkness to register a fourth win.
Andrew Flintoff's ruthless assault at the end in which he smashed 31 from just 12 balls could well prove to be the last straw for Jacques Kallis's beleaguered team who must be dreading the long coach trip to Cardiff.