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There was some brutal batting at the Arun Jaitley Stadium where three of South Africa's top four batters smashed rapid hundreds to help them rack up a tournament record total of 428/5.
Wicketkeeper-batter Quinton de Kock has announced he would retire from ODI format after the tournament.
India won by 7 wickets with Iyer unbeaten on 113 after Kishan made 93.
The 29-year-old will remain available in white-ball cricket.
De Kock, who also revealed he has mixed race family, said he meant no disrespect and "would love nothing more than to play cricket for my country again".
The stumper-batter cited "personal reasons" after the South Africans were directed to take a knee in their remaining matches in the tournament.
South Africa's director of cricket, Graeme Smith, had previously said the workload of captaining the Test side would be too much for white-ball skipper de Kock, but the selectors have had a change of heart.
Steyn said de Kock is a 'proper cook' and staying with the current Proteas skipper would allow him to watch all the fishing videos the wicketkeeper-batsman watches.
Left-arm spinner George Linde has been named in the ODI squad for the first time.
Veteran fast bowler Dale Steyn, who recently retired from Test cricket, was overlooked from the T20 series by the CSA.