India have enforced the follow-on after hustling Australia out for a first-innings 300.
On a rain-delayed day four in Sydney, Australia started to crumble early on, losing the wicket of Pat Cummins for 25 and Kuldeep Yadav going on to dismiss Nathan Lyon for a duck.
Yadav earned his five-wicket haul when Josh Hazlewood was given out lbw for 21 and India took the opportunity to make the hosts bat again.
India, who need only to avoid defeat at the SCG to seal a historic first Test series win on Australian soil, declared on 622 for seven on day two.
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