New Delhi: India beat South Africa by 337 runs in the fourth and final test to win the series 3-0 at the Ferozeshah Kotla stadium on Monday.
Now India move to second spot in ICC Test ratings, three points behind South Africa.
Chasing 481 for victory, South Africa resumed day five on 72-2 and folded for 143 soon after the tea break after some dour display by their top order.
AB de Villiers (43) top-scored for the visitors, while Ravichandran Ashwin (5-61) was the pick of the Indian bowlers in the second innings.
Going by the way things were going, it looked impossible as AB de Villiers was offering superb resistance. Ravichandran Ashwin picked up yet another five-wicket haul and Umesh Yadav finishes with three.
However, Dane Vilas was the first to fall in the post-tea session for 13. He dragged a ball outside off on to his stumps. This opened the floodgates as de Villiers was the next to go for a 297-ball 43. This is the third slowest innings by a batsman playing over 200 deliveries. Ravichandran Ashwin dismissed de Villiers as he was caught at leg slip.
Kyle Abbott was the next in line as a full in-swinging delivery knocked over a couple of stumps. India could just sense a win at this stage and Umesh was absolutely on fire and he got out caught behind after Wriddhiman Saha took an excellent catch behind the wickets.
India were on a roll Morne Morkel was the last man to go after he left alone a ball from Ashwin.
The Proteas scored just 42 runs from 31 overs in the second session after losing the wickets of Faf du Plessis (10) and JP Duminy (0).
De Villiers, who holds the record for the fastest half-century and century in one-day cricket, anchored one end and showed remarkable resolve on a slow track that offered occasional bounce.
The batsman appeared undeterred despite taking three painful blows on his hands against paceman Umesh Yadav.
Ravindra Jadeja trapped du Plessis leg before wicket in the post-lunch session but not before he had played out 97 balls.
Jadeja's spin partner Ravichandran Ashwin then removed Duminy lbw for a duck to reduce the Proteas to 112-5.
Captain Hashim Amla and de Villiers had resumed the day with the same dogged resolution that they showed on Sunday.
Their ultra-defensive batting clearly frustrated Indian skipper Virat Kohli, who even brought himself on to bowl one over.
But it was Jadeja who gave his team the key breakthrough with the new ball.
The left-arm spinner made the ball drift into the right-handed Amla. He tried to defend once again but the ball sneaked past to hit the top of his off-stump.
Amla's nearly five-hour stay at the wicket yielded just 25 runs off 244 balls, the slowest in Tests by a batsman who has played 200 balls or more.
The 27-run stand that Amla shared with de Villiers off 253 balls was the lowest among all Test partnerships involving 200 or more balls.
Jadeja impressed the most with the ball, giving away just 26 runs from 46 overs -- 17 of them consecutive maidens.
India have been on top of their opponents throughout the series and it is only fitting that they win the series 3-0. India had beaten South Africa inside three days both in Mohali and Nagpur either side of the rain-ruined second Test in Bangalore.
India - 334 (Rahane 127, Abbott 5-40, Piedt 4-117) and 267 for 5 dec (Rahane 100*, Kohli 88, Morkel 3-51)
South Africa - 121 (de Villiers 42, Jadeja 5-30) and 143 (de Villiers 43, Aswhin 5-61, Yadav 3-9)
Result - India won by 337-runs
MOM - Ajiyanka Rahane (India)
Man of the series - R Ashwin (India)