Great Britain missed out on the United Cup quarter-finals after Australia qualified from Group C with a 2-1 victory over the United States.
Hosts Australia reached the last eight after Storm Hunter and Matt Ebden beat Jessica Pegula and Rajeev Ram in a mixed doubles decider.
Earlier, Pegula beat Ajla Tomljanovic to level after Australia's Alex de Minaur beat Taylor Fritz.
Australia's win meant GB were edged out, finishing third in a tight group.
All three nations won one and lost one of their two ties in Perth, as well as each finishing tied on three match wins and three losses.