
On the last day of action at the West Australia state titles, Japan's Ryosuke Irie clocked 53.32 to lead his team's medley relay to victory in 3:38.99.
That solo effort took Irie to the helm of the early 2012 world rankings ahead of Matt Grevers (USA), on 53.55 at the Austin GP this month, and world champion Camille Lacourt (FRA), on 53.59 at the Nancy International yesterday.
Earlier in the session, Irie, 21, finished first in the 50m backstroke in a state all-comers record of 25.24, inside the 25.54 mark he clocked in qualification yesterday.