In one of her first major regattas since returning to the Laser last September, in a bid for the Irish Tokyo slot, the National Yacht club star is the top Irish woman from four contesting the championships at the Sandringham Yacht Club in Melbourne.
Murphy has counted a race win but also a black flag penalty to be placed 19th overall so far in the championships that have featured strong and light winds and some 'chilly' conditions.
The Men's and Women's Laser Radial classes are sailing together, split into Yellow and Purple fleets.
With the Australian selection for Tokyo 2020 still to be decided, Queenslander Mara Stransky struck an early blow with two wins in Purple fleet. Yumiko Tombe of Japan was second and Marie Burrue (FRA) was third in the first race. All three were pleased to have beaten Rio 2016 gold medallist, Marit Bouwmeester, who finished fifth overall and fourth woman.
Murphy's rivals for the Tokyo berth (that will be decided in selection trials later this year) are all sailing in the gold fleet and currently placed as follows: Aoife Hopkins 32nd, Aisling Keller 37th and Eve McMahon 60th.
The championships were subject to a protest by a competitor under 'Air quality' but the complaint was dismissed.