It was hard going at the start with cracks appearing on the pitch, with Pakistan’s pace bowlers beating the bat and causing problems.
Impressive debutant Khurram Shahzad got a breakthrough in the fourth over of the day, trapping Smith lbw for 45 with a ball that nipped back.
Enter the aggressive Travis Head, who stroked a straight drive boundary off the second ball he faced to signal his intent.
But he lived dangerously and a misjudged drive off Aamer Jamal went straight to Haq at cover, out for 14.
Both Marsh and Khawaja survived reviews in the same eventful Jamal over as Pakistan ratcheted up the pressure.
Marsh hit sixes off Jamal then spinner Salman to keep the scoreboard moving, before a huge escape on 23 when Masood dropped a sitter at mid-off.
At the other end, Khawaja kept grinding away to make a 25th Test half-century off 151 balls, accelerating after he reached the mark.
Marsh cracked a thunderous drive off Shaheen Shah Afridi to bring up his second 50 of the match as both men attacked the bowling after lunch.
Khawaja raced to 90 with some audacious boundaries before his luck ran out going for another big shot, caught by Azam off Afridi, which brought about the declaration.
They now head to Melbourne for the Boxing Day Test before the series wraps up in Sydney.
