In superb form, he fearlessly attacked Australia for 134 in piloting England to 343-7 at stumps, a decent score on a so-so Sophia Gardens pitch after electing to bat first and running into immediate trouble.
Luck was with Root.
Captain Alastair Cook and Ian Bell had just gone in successive overs, England was 43-3 in overcast conditions and, on the second ball he faced, Root tried to jam a Mitchell Starc delivery and edged behind.
Root was just a tyro then. Now he's the world's leading run-scorer in tests since May last year, averaging 85 with five centuries in 13 tests. He has hit 1,321 runs for England in all formats this year. The ball comes to him the size of a balloon, and he's blowing it around to all parts.
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Their stand of 153, undefeated through the middle session, ended when Ballance was lbw to fast bowler Jason Hazlewood for 61, nine above his test average, off 149 balls.
In the next over, Root brought up his seventh test century, and second against Australia, with a 14th boundary through the covers, and a 14th cheer of "R-o-o-o-t" from the capacity crowd.
The disappointingly toothless pitch allowed Stokes to add 52, Jos Buttler 27 until five minutes from stumps, and Moeen Ali an unbeaten 26. Stuart Broad was the nightwatchman and yet to score.