(Reuters) - Head coach Dave Rennie is confident back-to-back Rugby Championship wins over world champions South Africa will give Australian fans a much-needed boost after three confidence-sapping defeats against New Zealand.

The Wallabies handed the Springboks a 30-17 loss in Brisbane on Saturday to follow up a last-gasp victory over the South Africans the previous weekend, although the result was not enough to keep Australia's title hopes alive.