Brisbane Roar have strengthened their position as A-League leaders by thrashing third-placed Melbourne Victory away from home.

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Former Manchester United midfielder Lee Miller fired Brisbane ahead just before the half-hour, before Matt McKay doubled the visitors' lead on 57 minutes.

Dimitri Petratos completed the scoring in the 68th minute and a miserable day for Melbourne was topped off moments later when Adrian Leijer was sent off for collecting his second yellow card.

Brisbane are now seven points clear of second-placed Western Sydney Wanderers in the league table and 11 in front of Victory.