South Africa are perceived to have an advantage in their decisive Rugby Championship clash against Argentina in London, but captain Siya Kolisi warned that the Springboks’ performance had to match their title ambitions. South Africa thumped Argentina 67-30 in Durban last weekend, a result that took them top of the table. “It is only an advantage if we make use of it,” Kolisi told reporters on Friday. “It’s the fight they have compared to the years before, it is how consistent they have been in the way they play,” Kolisi said. “There are a couple of guys playing who have not won the Rugby Championship, so that is in the back of our minds,” he said.