Australia are currently ranked fifth with 101 points while England are third, 15 ahead. Australia can return to the top four by leapfrogging Pakistan if they manage to draw or win the Ashes series. They can also move ahead of England to third spot if they win the series 4-0 or better.
For England, the series offers an opportunity to reclaim the No.2 ranking they held till India moved ahead last week following their 2-0 win over the West Indies. However, to make that happen, England will have to win the Ashes series by 4-0 or better.