Having beaten the hosts 2-1 in the ODI series, under Raj's captaincy, they hold an unassailable 2-1 lead in the T20Is as well.
Farhaan Behardien dropped two catches on Sunday, including this hard effort from the bat of Suresh Raina.
India's tour had gained momentum with victory in the Wanderers Test and then they carried it through to the ODI series.
Earlier, Manish Pandey and Mahendra Singh Dhoni slammed quickfire half-centuries to guide India to a challenging 188 for four. It has been down to two match-winning knocks from him that South Africa have beaten India twice in eight matches during this limited-overs' leg of the tour.
Kohli needs 17 runs to become the first Indian and third cricketer to reach the 2,000-run mark in the shortest format of the game. More rain was predicted for the evening, and as it transpired, a sizable period of the game was played under a fine drizzle. Faced with the pressure to meet the DLS par score target, openers JJ Smuts and Reeza Hendricks took unnecessary risks and both lost their wickets. Was it a blip from India's point of view? We expect them to show some fight.
After what happened in the first two Tests in South Africa, going into the first Test without proper acclimatisation or warm-up matches, serious thought is being given to going into major assignments with proper preparation, starting with the tour to England.More news: Mark Cuban fined for 'tanking' comments
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Despite these eye-catching performances‚ the 26-year-old is well aware that he is likely to make way when established batsmen Quinton de Kock‚ captain Faf du Plessis‚ AB de Villiers and Temba Bavuma return to the squad.
"At the toss, we spoke about this being a semi-final and taking the series to Newlands". Way we started with the ball was exceptional.
"We've got to look at ourselves in the mirror, ask how we can improve and get better", he said.
"I think the way we actually batted tonight, it's a good way to chase a total".
Duminy was cool as cucumber as he never panicked after Klaasen's dismissal and finished off the chase in style with two consecutive sixes of Unadkat.
That prompted South African captain Jean-Paul Duminy to come into the attack and the off-spinner had an immediate impact as Dhawan hit his second delivery into the hands of Farhaan Behardien at mid-on. The duo took time to settle down but once they got their eyes set, they smashed the South African bowlers to all around the park. "Hopefully we can put up a good spectacle". More rain was possible. Dhoni's onslaught caught the bowlers off-guard and he blazed away to a 27-ball fifty to increase the visitors' run-rate in the dying overs of the innings.