Springboks scrum-half Ruan Pienaar believes containing Wallabies captain Will Genia could help his team prevail in Saturday's clash in Perth.
Pienaar has identified Genia as Australia's dangerman and feels his battle with the Reds number nine is the most difficult assignment that any player in his side will face.
"Will's probably the most important guy in the Australian side so it's a big challenge for me, but I think that's why you play rugby to play against the best guys and hopefully I can do a proper job," Pienaar told AAP.
"Obviously for me he's probably the best nine in world rugby for a couple of seasons now and he's a player who can create something out of nothing.
"I think the whole Australian team will be keen to do well (after back-to-back losses to New Zealand) and we didn't get what we wanted out of those two Argentina games (one loss and a draw) ... so it's going to be an interesting game and a tough game."
Pienaar knows how how important a win is for the Springboks and the Wallabies as both teams are some way off the pace set by the table-topping All Blacks.
"It's a must-win for both teams and for us travelling over here it's a big challenge playing in Perth," he said.
"Both of us are under a bit of pressure and want to perform well and build momentum going forward in this competition."