Pune, Oct 12: Ravichandran Ashwin made a crucial breakthrough late on day three as India pressed home their advantage against South Africa in the second Test.
The Proteas started Saturday (October 12) on 36-3 and were all out for 275 in their first innings by the close of play, still 326 runs behind the hosts in Pune.
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It could have been worse for South Africa, but India's bowlers were frustrated by a magnificent 109-run partnership for the ninth wicket between Vernon Philander and Keshav Maharaj that spanned 259 balls.
But India ended the day on top after the impressive Ashwin (4-69) claimed two vital wickets in the final four overs of the day.
South Africa were on 271-8 until Ashwin dismissed Maharaj, who had batted with a sore shoulder for a career-best 72, before the spinner also accounted for number 11 Kagiso Rabada (2), leaving Philander stranded on 44 not out.
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Pace bowler Umesh Yadav took 3-37, with India – who declared on 601-5 in their first innings - looking good for a victory that would seal the series.
With two days still to play, their next decision will be whether to enforce the follow-on.
India captain Virat Kohli, who will make that call, followed up his double-hundred with the bat by taking an early catch on Saturday to remove nightwatchman Anrich Nortje off the bowling of Mohammed Shami (2-44) for 3.
South Africa were in disarray at 53-5 when Theunis de Bruyn was caught behind off Yadav for 30, with captain Faf du Plessis and Quinton de Kock left to steady the ship somewhat by combining for a quickfire 75.
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Ashwin bowled De Kock for 31 before lunch, though, and Senuran Muthusamy (7) was out lbw to Ravindra Jadeja (1-81) in the third over after the interval.
Du Plessis (64) had reached his 21st Test half-century off just 64 balls but his pace slowed from there and, when Ashwin found his outside edge, the Proteas were poised for a collapse at 162-8.
However, Philander and Maharaj had other ideas with a disciplined, dogged partnership amid hot and humid conditions.
Maharaj aggravated his right shoulder – which had been injured while fielding on Friday – as he smacked Shami for four while on 17, but he bravely fought on to earn a first Test half-century in a 132-ball knock.
But Ashwin capped fine outing by having Maharaj caught by Rohit Sharma at leg slip and promptly trapping Rabada in front, with Philander unbeaten having faced 192 deliveries.