Rhys Mainstone (57:05.6) and Trent Grimsey (57:10.9) finished first and second at the 5 km open water swim on the opening day of the Oceania Swimming Championships in Nouméa, New Caledonia today.

The Australian duo were followed by Isaac Foote (1:01.38.1) and Troy Balvert (1:01.38.5), both representing New Zealand, battling it out stroke-for-stroke for third.

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