Michael Carberry presented a compelling case for a Test comeback with his maiden England century as he and Alastair Cook produced a monumental statement of intent against Australia A.
Carberry, preferred at the top of the order to Joe Root, and Cook - in his first innings of the tour after missing the opening match with a sore back - made 153 and 154 respectively as an England pair batted through the day for the first time since 1998.
The reward was a triple-century stand, something achieved previously just twice in Tests by any England openers, on the way to an unbroken 318 by stumps at the Bellerive Oval.
They had to come through a testing first hour against the new ball but otherwise made the most of relatively easy pickings, in conditions thousands of miles away from what England can expect in the first Test at Brisbane.
Carberry, who left especially well throughout, was outscored initially by his captain but - after taking 140 balls over his first 50 - needed only another 59 for his second, hitting 17 fours and a six in his hundred.
Cook's 183-ball century was more evenly paced and contained some trademark cuts and back-foot forces as well as two cover-drives on the up among his 12 boundaries.
The England captain had acknowledged on the eve of this second tour match the non-negotiable requirement to avoid losing early wickets in this Ashes campaign.
His team overcame that frailty to beat Australia 3-0 at home in the summer, but Cook practised what he had preached at the first time of asking as he seeks to follow up the prolific run-making that underpinned England's 2010/11 success in Australia.
He showed just occasional signs of discomfort from his back but never appeared significantly inhibited.
Carberry was at ease too, as he staked his claim to just a second Test cap to go with his previous appearance as deputy for the rested Andrew Strauss in Chittagong three and a half years ago.
After his 78 in Perth last week, the 33-year-old left-hander retained his accustomed position as opener - while Root was listed to come in at number five.
Carberry and Cook needed their wits about them in the early exchanges as the new ball moved lavishly off the seam after England had won the toss on a sunny morning.
Cook played and missed several times yet was rarely close to an edge; Carberry needed 16 balls to get off the mark, with a clip off his thigh for four off Ben Cutting.
When Moises Henriques introduced left-arm spinner Jon Holland, Carberry twice used his feet to hit over long-off.
He spent seven overs stuck on 44 but did not lose his cool and completed his fifty when he chiselled his ninth four off a thick outside edge on an attempted square drive off Henriques just before afternoon drinks.
When Holland returned Carberry successfully went over the top again, for six this time - and then, with his century in safe keeping, he twice repeated the dose over long-on off Glenn Maxwell's off-spin.
Between mid-morning and tea, neither batsman had a remotely anxious moment, and it was not until the second new ball was taken under cloud cover that Carberry needed some luck - dropped in the gully off Cutting, on 135.