Australia head coach Justin Langer has backed out-of-form opener David Warner to come good in the fifth and final Ashes Test beginning Thursday at The Oval.

Warner has been in awful form in the ongoing Ashes scoring just 79 runs at an average of 9.87 per innings. The left-handed opener has endured a tough series tackling the new ball, particularly against England seamer Stuart Broad, and has managed just one double-figure score (61) in eight innings with ducks from each of his last three starts.