The highlight of Gill's knock was how frequently he danced down the track against the fast bowlers while Iyer's aggressive intent from ball one stood out in a scenario where he was desperately searching for runs.
Both Iyer and Gill got their half-centuries with straight sixes, off debutant Spencer Johnson and Green respectively.
Conditions were ideal for the batters but the Australian attack, missing the likes of Mitchell Starc and Pat Cummins, looked short on ideas. Lead spinner Adam Zampa too could not stem the flow of runs.
Iyer was the first to complete a century, his third in ODIs, while Gill got to the milestone, his sixth in the format, 19 balls later.
When both the batters departed, Rahul and Kishan (31 off 18) played some bold strokes to up the scoring rate.
Suryakumar, who had to change his game in the previous match to adapt to the needs of ODI cricket, came out to bat in the 41st over.
In the T20 context, it was an ideal time for him to come and explore his 360 range from ball one. He did just that to power India to a formidable total.
His innings included four sixes in a row off Green in the 44th over. The towering pacer conceded 103 runs in his 10 overs, so symbolic of their wretched outing with the ball on the day.
Australia were never in the run chase after losing their first two wickets off successive deliveries from pacer Prasidh Krishna in the second over. Both Matthew Short and Steve Smith fell chasing wide deliveries.
The extra bounce that Krishna generates contributed to Smith's dismissal with Gill holding on to a flying catch at first slip.
Warner then enthralled the spectators with his stroke play, batting both right and left-handed.
He batted right-handed mainly to Ashwin who got the ball to turn even after the rain break. After sensationally sweeping Ashwin with his right-hand, Warner was adjudged leg before-wicket as he attempted a reverse hit from the unusual stance.
India were guilty of dropping two catches in the field. Ravindra Jadeja too got plenty of purchase from the surface and ended with three wickets.