South Africa were in early trouble, after a brief rain delay at the start of play, when Aiden Markham went without scoring in the second over of the day.
South Africa have been second-best in the One-Day International and Twenty20 series in England this year, and also suffered a first-round exit in the Champions Trophy, but Elgar believes the red ball can signal a change in fortunes.
Images from Day 3 in the first Test between South Africa and India, at SuperSports Park, Centurion, on Thursday.
South Africa skipper Dean Elgar and team manager Khomotso Masubelele met match officials during the lunch break on Day 2 of the second Test, in Johannesburg, to discuss a questionable caught behind dismissal of Rassie van der Dussen.
'We always knew we would be under pressure if the conditions went around a bit.'
Elgar expects the players to be up for the fight.
Jasprit Bumrah and Mohammed Shami took three wickets each as the tourists bowled South Africa out for 191 to claim an emphatic 113-run victory just after lunch on the fifth day of the first Test in Centurion on Thursday.
Dean Elgar feels the SA batters got a 'window period' to go after the target in the 3rd Test following India's on-field outburst on the DRS call
Images from Day 2 of the second Test between India and South Africa in Johannesburg on Tuesday.