Australia were staring down the barrel of trouble when Smith arrived at the crease on day two, but 24 hours later he had for the second time this series flipped an Ashes match on its head and had England losing their tenuous grip on the urn.
The Aussies reached stumps in front by 146 runs at 549-4 — with Smith and Mitchell Marsh (181 not out) in utter control.
During his surge past 150, Smith passed the 1000 runs in a season barrier for the fourth consecutive calendar year. Only Matthew Hayden has bettered that mark — scoring 1000 for five consecutive years.
Smith took just 138 balls to register his faultless century, and it was the contrast with his 261-ball ton in the first test in Brisbane that summed up the skipper's unparalleled talents in the modern game.
"I think he's the smartest batsman around. The difference between him and the others is that no batsman adjusts quicker to the conditions.
"He can score a century off 140 balls when the conditions are good," said Slater.
"Or off 300 balls if he has to. That's the difference.
"A lot of the batsmen don't play smart like he does. This was one of his great innings."
Smith famously debuted as a spin bowling all-rounder batting No8 back in 2010.
By the time he made his first hundred three years later, he had been dropped for a number of seasons and had a test average of 29.
Since then Smith has slaughtered 22 tons in 48 tests at a mind-blowing average of 71.
Some wondered if the pressures of captaincy would weigh down Smith like they have Joe Root.
Nope.
Since becoming skipper his average has soared to over 73.
"It's as good as he's ever been," said Taylor.
The key difference for Australia yesterday as opposed to so many of Smith's other masterclasses, was that this was not entirely a one-man show.
Mitchell Marsh played beautifully in his return to test cricket to post an unbeaten 301-run stand with Smith, which backed up partnerships of 100 (Usman Khawaja) and 50 (Shaun Marsh) with the Australian skipper.
The all-rounder dictated the bowling absolutely superbly from the moment he came to the crease today, with Australia still more than 150 runs behind on the scoreboard.
England great Kevin Pietersen lamented the powder puff bowling tossed up to Marsh, with a limitless offering of half-volleys helping him bludgeon the scoreboard.
Marsh barely copped a fierce short ball on his way to a superb half century and accelerated in the final session, signing off with a total of 29 fours.
Smith, meanwhile kept his run-rate rocketing along and had 28 boundaries and a six at the close of play on day three.
