The Australians then put their foot down again to again create a six-goal buffer at quarter-time, 16-10, with shooters Sophie Garbin (10 from 10) and Kiera Austin (six from six) blemish-free.
Australia started the second quarter strongly to increase the lead to nine goals before Jamaica again climbed off the canvas to sneak within three goals.
But the Diamonds responded with aplomb, scoring nine of the next 10 goals en route to a 34-22 halftime lead.
By midway through the third quarter, Australia had powered to a whopping 22-goal advantage, 46-24, and had the visitors at their mercy.
The Diamonds led 54-30 at the last change before cruising to victory.
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Garbin logged 17 goals from 18 attempts and Austin 21 from 23 before both were substituted as Marinkovich tried fresh shooting combinations in Koenen (25 from 27) and Sophie Dwyer (nine from 11).
Marinkovich also swung changes in midcourt and defence – she deployed all 12 players in her squad in a test of depth ahead of netball’s showcase tournament at the Commonwealth Games in Glasgow.
“We are definitely exploring our depth and making sure that we have got great versatility,” Marinkovich said.
“And that’s the way the girls have been training – we have been able to adapt and we are using people’s strengths to shift things out in a game, as well as strategy.
“So it’s nice to have that option and I thought the players that came on brought that to the court and had impact.”
The Jamaica series continues in Perth on Sunday and concludes in Melbourne next Wednesday.
With AAP
