"I don't find anything to stop me from taking wickets except rank turners," said Thakur, who finished with figures of four for 70 in the South Africans' first innings of 302.
Thakur took all his four wickets in the space of 25 balls for eight runs, starting yesterday evening. He had snapped up visiting team's opener Stiaan van Zyl and night watchman Simon Harmer last evening, while today he added prized scalps of Hashim Amla and Faf du Plessis.
Thakur, however, admitted that South Africa's ODI skipper AB de Villiers was totally unfazed.
"He batted very well and did not give us any chance."
Also Read
De Villiers made a superb 112 to rescue the South Africans from a difficult 57 for five at one stage, in reply to the home team's 296.
De Villiers also put on a half-century stand with Temba Bavuma (15), followed by a century partnership for the seventh wicket with wicketkeeper Dane Vilas, who made 54.
Thakur, who has been performing consistently over the last few years for Mumbai and has also played for India A against South Africa A this season, said this had been his best show this season.
"When you are playing against a quality opposition you need to remain focused right through, unlike in Ranji Trophy where you can take it easy sometimes. I was looking to put all my energy into every ball I bowl," he said.