Cook struck 72 after Australia\'s 385 but his dismissal, followed by Pietersen\'s quick departure, after tea restricted England to 180/4 in Perth.
(For ball-by-ball commentary, scroll down to the bottom of the page)
Day 1 Round-up: Steven Smith posted his first hundred on home soil to help Australia recover from another stuttering top-order performance and reach 326 for 6 at stumps on Friday on day one of the third Ashes Test.
After winning the toss and batting for the third consecutive Test, Australia slumped to 143 for 5 before Smith combined with vice-captain Brad Haddin (55) in a 124-run, sixth-wicket stand. He was unbeaten on 103 at stumps, batting with Mitchell Johnson (39 not out).
Australia won the first two Tests and are aiming to regain the Ashes with victory at the WACA, where England's last win was in 1978.