Meanwhile, Paceman Josh Hazlewood reckons England are scratching their heads trying to find a way to break the one-day stranglehold Australia have over them.
The win in Perth was Australia's fourth in a row over their oldest rival and eighth in their last nine contests against England in 16 months. The two teams clash at the MCG on February 14.
"I don't think they quite know how to beat us yet, especially in Australia," said Hazlewood. "We've obviously proved that over the last few years, especially this series again, beating them a few times. They will be scratching their head, I guess, of how to get on top of us in this first [World Cup] game."
Hazlewood agreed left-arm paceman Mitchell Johnson appeared to have England's number, as he followed up his 2013-14 Ashes demolition of them with another wrecking job in the Tri-Series final.
He was excited at the prospect of opening the bowling at the World Cup and providing a right-hand alternative to left-arm flamethrowers, Johnson and Mitchell Starc.