MELBOURNE - Kaylee McKeown broke Stephanie Rice's long-standing Australian record in the 400 metres individual medley with a scintillating swim on Thursday but confirmed she would not chase a medal in the event at the Paris Olympics.

A day after breaking Rice's 200 IM record at the Australian Open Championships, McKeown took down her 400 mark from the super-suit era with a swim of four minutes 28.22 seconds, the fourth fastest all-time in the gruelling event.