Young opener Matt Renshaw (60) and experienced Shaun Marsh (66) battled hard against the Indian spinners. Their fighting half-centuries consolidated Australia's position in the match but Virat Kohli's captaincy left a lot to be desired.
On a pitch aiding spinners, left-arm spinner Ravindra Jadeja (3/49), the home team's top wicket-taker, got to bowl only 17 overs compared to Ravichandran Ashwin (1/75 in 41 overs)
While Ashwin bowled a tight line and beat the bat on occasions, it was Jadeja, who looked like the most lethal among Indian bowlers. To their credit, the Australians gave a better account of themselves on a two-paced pitch.
It was perhaps one of the most intense and intriguing days of Test cricket in the current home season where the batting team managed a total of 197 runs off 90 overs in a single day's play.
A first innings lead of even 100 runs would be as good as a 175-run lead on this track, which would make it even more difficult for the Indian batsmen, already under pressure after three poor innings of under 200 runs.
Skipper Steve Smith (8), for a change, was dismissed cheaply with Wriddhiman Saha taking a fantastic catch off Jadeja's bowling.
But the partnership that turned out to be crucial was the one between Renshaw and Marsh senior which yielded 52 runs.
The duo came together at 82 for 2 and they consumed more than 25 overs. It was the manner in which they handled Umesh Yadav's reverse swing and the two spinners which made it difficult for the home team.
(REOPENS DEL 29)
One cannot take anything away from the two Indian pacers Ishant Sharma (1/39 in 23 overs) and Yadav (1/57 in 24 overs), who bowled their hearts out with little success.
Umesh in particular bowled an engaging spell during the first session where his reverse swing kept both Renshaw and Smith on tenterhooks.
Umesh finally was rewarded at the fag end of the day when Marsh clipped one to Karun at short mid-wicket having faced 197 balls hitting four boundaries.
They were ready to wait for the loose deliveries as in the 106 overs so far, the Australian batsmen have hit only 18 boundaries and a six.
They ran singles well and after a point in time, one could feel that Ashwin was overbowled. He looked jaded now into his 11th straight Test match in the home season.
Jadeja, on the otherhand, wasn't given an extended spell in any of the sessions despite looking more potent compared to Ashwin.
The other wicket taker was Ishant Sharma who dismissed Mitchell Marsh for a duck at the stroke of tea.
Australia could muster 76 runs while losing three wickets in 35 overs in the session. Shaun Marsh was batting on 38 from 127 balls at the break.
The Indians toiled hard for more than 20 overs in the second session without any success with young opener Matt Renshaw and Shaun Marsh showing tremendous application on a turning track for a 50-plus partnership.
Renshaw departed in the 67th over and that changed the scenario as Australia lost three wickets in 13.3 overs for the addition of just 29 runs.
Peter Handscomb (16) and Mitchell Marsh (0) were out in the space of 3.2 overs. Renshaw's 60 came from 196 balls and he hit five fours and a six.
Australia now trail by 26 runs with five first innings wickets in hand on a difficult Chinnaswamy Stadium pitch where run-making has been extremely hard.
