A dogged Usman Khawaja and a defiant skipper Steve Smith engineered Australia's most productive session on the tour, taking their side to 149 for 2 at tea against India on the opening day of the fourth Test, here on Thursday.

Khawaja, who had scored a polished half-century in Delhi, showed admirable determination to remain unbeaten on 65 off 180 balls as he added 88 runs for the unbroken third wicket with Smith (38 batting).