Barton fell in three sets to Gilles Muller while Thompson (pictured) went down 7-5 6-4 to Philipp Kohlschreiber in blistering 41 degree heat at Olympic Park.

Alex De Minaur is the only remaining Australian in the tournament and faces Andrey Kuznetsov on Wednesday night for a quarter-finals berth.

Tournament favourite Dominic Thiem takes on Portuguese qualifier Gastao Elias tonight in preparation for the Australian Open.