Addressing mediapersons here, after the second days' play, Sehwag, who blasted 52 of 59 balls in his unbeaten knock along with Jaffer, who was batting on 25, said India has to get as close as possible to South Africa's score of 540.
''If we achieve this, we can turn the pressure back on them in the second innings'', he said.
He said it would be very difficult for South Africa to score runs off Harbajan in the last two days.
''We will bat for two days to put up a good total on the board.
Our bowlers will come back and put pressure on them,'' he said.
To a question, Sehwag agreed that it was a difficult task for Indian bowlers on a flat wicket and the heat made it even more so.
''But still our bowlers did well and remained patient to take all the ten South African wickets'', he said.
Sehwag also said the Indians were prepared to face the heat and humid conditions as it was normal in the month of March. Even in Ahmedabad and Kanpur the conditions would be bad. But the team was used to such conditions at home.
He pointed out that Hasim Amla batted very well for his century.
''We never expected that he will bat so well. He has improved a lot from his Test match exposure'', he observed.
Hasim Amla rated his century as the second best of his career.
''It was a very good wicket to bat. I was thinking of a big score but unfortunately I was run out'', he said.
He also pointed out that it was a very difficult to bat in such humid conditions.