Pat Cummins dismissed both India's openers, including KL Rahul on the last ball before tea, to leave India 51 for two on day two of the fourth test on Friday after another Steve Smith century helped the hosts post an imposing first innings 474.

Resuming on 311-6 after a dominant opening day, the hosts plundered another 163 runs before finally being dismissed soon after lunch.

Australia captain Pat Cummins won the toss Thursday and decided to bat first against India in expected hot conditions at the Melbourne Cricket Ground in the fourth test of the five-match series. Australia made two changes to the side which dominated the drawn test in Brisbane.

Australia Test debutant Sam Konstas hits a pulsating half-century on a thrilling opening day of the fourth Test against India.

Teenage debutant Sam Konstas has propelled Australia to 6-311 at stumps on day one at the MCG after one of the most memorable Boxing Day innings.