Sussex wicketkeeper Matt Prior suffered another big disappointment with the bat as England struggled again in The Ashes.

Prior was dismissed for nought on the third day of the second Test as England were all out for 172 in reply to the Aussies' mammoth 570-9 declared at the Adelaide Oval.

Australia opted against enforcing the follow-on and were 132-3 at the close, a lead of 530.

Prior was forced on to the back foot by rampant quick Mitchell Johnson, who then went fuller and enduced an edge to keeper Brad Haddin.

Johnson finished with 7-40, including 6-16 after lunch.