The Illawarra Hawks have finished third on the NBL ladder after Brisbane upset the fourth placed Phoenix 94-84 in the last game of the regular season.
The result means the Hawks will take on the Wildcats in the semi-finals with the best of three game series tipping off in Perth tomorrow night.
The Hawks won their most recent outing against the reigning champions with a thrilling 81-79 victory in Wollongong last Tuesday.
Brian Goorjian's team will fly west today before hosting game two in Wollongong on Saturday evening.
The third game of the series will be played back in Perth on Monday night if required.
NBL Commissioner Jeremy Loeliger congratulated Melbourne United, Perth, the Illawarra Hawks and South East Melbourne Phoenix on making the finals in a season filled with challenges.
"We have always said you can expect the unexpected this season but one thing that has remained constant is the world class basketball on display in the NBL.
"These four teams have had sensational seasons and will now battle it out for the championship in what promises to be a thrilling Finals series," he said.
Melbourne United and the Phoenix will each host their home semi's in New South Wales without crowds at Qudos Bank Arena to ensure they can compete uninterrupted by travel restrictions.
PERTH WILDCATS V ILLAWARRA HAWKS
Game 1: Thursday 10 June, RAC Arena, 9:30pm AEST / 7:30pm local
Game 2: Saturday 12 June, WIN Entertainment Centre, 5:30pm AEST
Game 3 (if required): Monday 14 June, RAC Arena, 9:30pm AEST / 7:30pm local
All games can bee seen on ESPN, SBS Viceland and SBS on demand.