Steve Smith has opted against enforcing the follow-on after Australia rolled West Indies for 271, claiming a first-inning lead of 280 runs at the MCG.
If Australia's pacemen skittled the tourists quickly on day three of the second Test it is likely Smith would have put them back in.
But the hosts took 100.3 overs to claim 10 wickets and Smith was wary of overworking his quicks, especially with the SCG Test starting on Sunday.
Peter Siddle was proppy towards the end of West Indies' first innings, while Josh Hazlewood only sent down a pair of four-over spells and a two-over burst on day three.
Nathan Lyon finished with figures of 4-66 from 29 overs to be the pick of the bowlers.