The excellence of Maharaj was in sharp contrast to the lack of control exhibited by England's spin pair of Liam Dawson and Moeen Ali, neither of whom will look back on their experience at Trent Bridge with any great pleasure.
Westley has been brought in after England number three Gary Ballance was ruled out with a finger injury, although the Yorkshire batsman's lack of runs might well have seen him dropped.
England had a setback soon after captain Joe Root won the toss and elected to bat despite the overcast conditions and green-tinged pitch that promised to assist the Proteas' pace attack. England faces the problem of being a little too dependent on Root if things go wrong out in the middle and they must avoid putting too much pressure on him and the lower middle order.
South African batsman J.P. Duminy is to return home ahead of the third Test against England in a move that could signal the end of his Test career. So far, they've been either side of that middle and their challenge is to find consistency, especially as the decision on the future of the coach is yet to be made.
South Africa's ability to keep things simple played a large part in their eye-catching turnaround between Lord's and Trent Bridge.
The presence or otherwise of Dawid Malan as a possible third debutant in the Oval Test will instead be uppermost in the England captain's mind on Thursday morning. Five years ago, Hashim Amla became South Africa's only Test triple-centurion with an unbeaten 311 that set South Africa up for a massive win.
"It is probably in the top three or four venues in the world", he said of The Oval.
The temperature in England may not quite have hit the boiling point reached in Australia past year but should Joe Root's side bolster their batting with Dawid Malan, it will mean three new caps against a more settled touring side - and a side who have also welcomed back their head coach, Russell Domingo, after he missed the Trent Bridge Test for family reasons. "He's England's leading runs scorer", said Westley.
Meanwhile, Kagiso Rabada will be in no hurry to revisit the recent past. "You can't rock up and expect a Test match victory".
"KG is one of our best bowlers", Sport24 quoted Langeveldt as saying at the squad's practice in London on Monday. Whether he has also been working on his send-offs is yet to be seen. He will replace Duanne Olivier in the only change to SA's team.
The no-frills opener excelled in conditions which were far from easy for any batsmen as the ball moved around in the air and off the pitch nearly throughout - for the admirable Vernon Philander especially - after Joe Root chose to bat first on a day of many showers and only 59 of the scheduled 90 overs.