Australian sports journalist Jon Ralph, summed up the wicket, tweeting: "Jimmy Anderson is a dead set freak. Never gives up. Nearly always finds a way. So much admiration for the way he goes about it."
The very next over, Labuschagne was removed in similar circumstances to last week's MCG test, with Mark Wood finding the Australian No.3's outside edge with a delivery that was short of a good length outside off.
The hosts were suddenly three down, with Australian vice-captain Steve Smith and returning batter Usman Khawaja at the crease.
Khawaja, playing his first test match in more than two years, received a warm welcome from the Sydney crowd.
Khawaja finished the day unbeaten on four - with a boundary his sole scoring shot in 22 deliveries - and will start day two alongside Steve Smith (6*) at the crease with Australia 126-3, providing the weather allows for play.