Disappointed by India's defensive approach, former head coach Ravi Shastri has said Rohit Sharma did not show a "positive mindset" by electing to bowl in the World Test Championship final against Australia. 

India left out veteran off-spinner Ravichandran Ashwin and preferred a four-pronged pace attack to go with left-arm spin bowling all-rounder Ravindra Jadeja as they chose to bowl under overcast conditions.

The decision backfired as Steve Smith (95 batting) and Travis Head (146 batting) shared an unbroken 251-run partnership to put Australia in a commanding 327/3 heading into day two. 

"From what came out today, the mindset was to field if they won the toss, hence the choices in the bowling department -- four pacers one spinner," Shastri told ICC after the end of the opening day's play on Wednesday.

"If the mindset was positive you'd want to bat, rough it out in the first session and see if you can put 250 on board. Don't think too big 250-260 and if the conditions got better and you saw the first session through, you could have got more," he added.

India had Australia at 73/2 at lunch on day one but after the skies cleared up it became a batting beauty as Smith and Head swung the momentum in their favor.

Shastri further said Australia is in a prime position and it's up to Pat Cummins and his men to let India back into the marquee contest.

"I think Australia is in a prime position now. It's up to them to allow India back into the game, they batted beautifully, especially in the first session of play and that really set things up," Shastri said.