World Champions Australia will take on Rio Olympic Champions Argentina in the summit clash of the World Hockey League Final tournament tomorrow. In the second semi-final at Bhubaneswar today, Australia defeated World No. 5 Germany by a margin of three goals to Nil.Earlier, in the play off match for the fifth and sixth places, Rio Olympic Silver medalists Belgium defeated Spain by a solitary goal. While Belgium got the 5th spot, Spain settled for the 6th position. Hosts India who lost to Argentina by a solitary goal in the first semi-final, yesterday, will take on Germany tomorrow for the Bronze medal.