The Diamonds have clinched victory in their three-game series against South Africa with a game to spare after cruising to a 67-40 victory in Wollongong.

But coach Stacey Marinkovich is adamant there's still plenty of room to improve with the Constellation Cup against New Zealand on the horizon.

Fresh off an 11-point win in Bendigo, Australia flew out of the blocks to take a 2-0 lead in the series and extend their unbeaten record against South Africa to an extraordinary 48 wins from as many matches.

The win was set up by the Diamonds winning just the second of their past eight first quarters, while South Africa's game was riddled with errors as they struggled to go with Australia's tall timber in defence.

"We'll continue to test and try what we're trying to do," Marinkovich, who was del

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