Vice-captain Ben Stokes says skipper Joe Root is the best player of spin England have ever produced after his brilliant double century.
England were firmly in command on 555-8 at stumps in Chennai after Joe Root etched his name in the record books.
Ed Smith says Jonny Bairstow "endorses" the policy of resting players after he was not selected for the start of the India tour.
Jofra Archer, Ben Stokes and Rory Burns are back in the England squad to face India, but Jonny Bairstow was among those omitted.
Jofra Archer and Ben Stokes will not feature for England in the two-Test series against Sri Lanka but will return for the tour to India.
England chased down 180 to defeat South Africa at Newlands as they started their tour on a high.
South Africa and England get what promises to be a thrilling Twenty20 International series under way at Newlands on Friday.
After featuring in the Indian Premier League, Jofra Archer, Sam Curran and Ben Stokes have been given a well-earned break.
Rajasthan Royals have missed out on the Indian Premier League play-offs, but Kolkata Knight Riders could still qualify.
Chris Gayle became the first batsman to hit 1,000 T20 sixes as he made 99, though Kings XI Punjab still lost to Rajasthan Royals.