On this occasion , they have felt unable to take that risk .
England 's 3 - 1 success on their last tour of Australia was based on the excellence of their top four - and they succeeded without the cover of a spare opening batsman .
On this occasion , Australia have felt unable to take that risk .
England 's 3 - 1 success on their last tour of Australia was based on the excellence of their top four - and they succeeded without the cover of a spare opening batsman .