Khawaja clips Jadeja off his pads for a single and Labuschagne leans forward to block the flighted deliveries before he drives one through the covers for a couple of runs.
Khawaja happy to collect the singles as he hits Siraj off his pads for one.
Siraj resorts to his flip the bails tactics against Labuschagne, who switched it back again before he was dismissed a few balls later in the Brisbane Test.
But this time Labuschagne ignores Siraj's act by walking away towards the leg side.
Labuschagne plays a cracking straight drive, getting a good stride forward to stroke the ball straight back past the bowler for a four, to take Australia past 150.
Siraj overpitches as Labuschagne plays a sweetly-timed flick through square leg for three runs.