Osman Khawaja of Australia plays a shot during day three of the First Test match between Australia and Pakistan at The Gabba on December 17, 2016 in Brisbane, Australia.

Pakistan's paceman Mohammad Amir shines the ball as he gets ready to bowl during the third day of the day-night cricket Test match between Australia and Pakistan in Brisbane on December 17, 2016. / AFP PHOTO / SAEED KHAN / IMAGE RESTRICTED TO EDITORIAL USE - NO COMMERCIAL USE

Australia's captain Steven Smith celebrates as he reaches 50-runs during the third day of the day-night cricket Test match between Australia and Pakistan in Brisbane on December 17, 2016. / AFP PHOTO / SAEED KHAN / IMAGE RESTRICTED TO EDITORIAL USE - NO COMMERCIAL USE

Sarfraz Ahmed scored remained unbeaten on 59 as Pakistan folded for 142 in the first innings.

Mitchell Starc gave Australia the early breakthrough when he dismissed Sami Aslam.

Nic Maddinson encountered another failure before the hosts declared their innings at the dinner break at 202/5, with an overall lead of 489.

Azhar Ali was resolute in defence and finished the day's play unbeaten on 41.

Steve Smith scored a breezy 63 in a century stand with Usman Khawaja as Australia's lead swelled past 450.

Nathan Lyon removed a dogged Babar Azam at the fag end of the day's play.

Rahat Ali bowled a probing spell as Australia lost openers David Warner and Matt Renshaw after Smith didn't enforce the follow-on.

Osman Khawaja scored a typically stylish 74 as Australia upped the scoring rate in the second session.