Outplayed by an inexperienced and injury-plagued India, a shocked Australia head coach Justin Langer on Tuesday said one massive lesson that he has learnt from the setback is to "never ever, ever underestimate" the "really tough" players from that country.

The stunning three-wicket victory over Australia at the Gabba, that resulted in a phenomenal series win, propelled India to the top of ICC World Test Championship standings on Tuesday.

The BCCI on Tuesday announced a Rs 5 crore bonus for the Indian cricket team after the Ajinkya Rahane-led side won the fourth and final Test against Australia to clinch the series 2-1 and retain the Border-Gavaskar trophy.

A fearless India, driven by its courageous youngsters, pulled of an exhilarating three-wicket win over Australia in the fourth Test to claim the series 2-1 and retain the Border-Gavaskar Trophy here on Tuesday.

Shubman Gill announced his arrival on the global stage with a sublime 91 while Cheteshwar Pujara surpassed all pain threshold barriers to keep India on course for a challenging 328-run target, taking the score to 183/3 at tea on the final day of the fourth Test here on Tuesday.

Steve Smith's attacking half-century took Australia's overall lead to 276 even as India's greenhorn bowlers put their best foot forward during the first two sessions on the fourth day of the final Test here on Monday.

Fighting back through debutant Washington Sundar and Shardul Thakur, India scored 336 in their first innings in reply to Australia's 369 on day three of the series-deciding fourth Test here on Sunday.

Washington Sundar and Shardul Thakur turned unlikely saviours after three soft dismissals as India reached 253 for six at tea on the third day of the fourth Test against Australia here on Sunday.