An extraordinaty switch-hit six from David Warner and a Matt Wade half century fired Australia to a 31-run victory over India in the first of two Twenty20 matches on Wednesday.Australia's tally of 171 for four proved too tough a target for an India team hoping for a turnaround in fortunes after sufferiing a 4-0 hammering in the test series and the tourists managed just 140 for six in the rain-delayed contest.