Domain Group has initiated legal proceedings against rival REA Group in the Federal Court of Australia, challenging the property listings giant's assertion that it finds buyers for nine out of every ten properties listed on its platform.

The move marks a significant escalation in the long-standing rivalry between the two dominant players in Australia's real estate advertising market, transforming a commercial dispute into a high-stakes legal battle over market share and consumer trust.

REA Group, which operates realestate.com.au, has consistently promoted the "9 in 10" statistic as evidence of its superior reach and effectiveness for real estate agents.

Domain, which operates domain.com.au, disputes this claim, arguing that it is misleading and fails to reflect the actual distribution of buyer inquiries across the market.

The lawsuit seeks to hold REA accountable for what Domain describes as deceptive marketing practices that distort competitive dynamics.

This legal confrontation arrives at a precarious moment for REA Group.