Wales v Australia: Warren Gatland makes four changes in the pack for Millennium Stadium clash on Saturday Wales have lost their last six Tests against all opponents - their worst run of defeats since the 2002-03 season - and they will drop outside the world's top eight teams if they come unstuck on Saturday. A Wallabies victory would condemn Wales to the third tier of countries for next Monday's 2015 World Cup draw in London, while also meaning an autumn whitewash following the Six Nations champions' earlier defeats this month to Argentina, Samoa and New Zealand. Gatland said: "We need to pick up again from where we left off in the second half last week. We managed to retain 73 per cent possession after the break against the All Blacks and win the territory battle, and we need to put Australia under similar pressure from the outset. We have played them regularly over the last couple of years and have come close to winning on a number of occasions, but have not quite been able to get ourselves over the chalk of the finish line. Both sides have had injuries to cope with, but there is every reason for optimism. Wales XV: L Halfpenny (Cardiff Blues); A Cuthbert (Cardiff Blues), J Davies (Scarlets), J Roberts (Cardiff Blues), L Williams (Scarlets); R Priestland (Scarlets), M Phillips (Bayonne); G Jenkins (Toulon), M Rees (Scarlets), S Andrews (Cardiff Blues), I Evans (Ospreys), L Charteris (Perpignan), A Shingler (Scarlets), S Warburton (Cardiff Blues, capt), T Faletau (Newport Gwent Dragons). Replacements: K Owens (Scarlets), R Bevington (Ospreys), S Lee (Scarlets), R Jones (Ospreys), J Tipuric (Ospreys), T Knoyle (Scarlets), D Biggar (Ospreys), S Williams (Scarlets).