Johanna Konta and Katie Boulter fell to three-set defeats in their Australian Open warm-up event, while fellow Briton Dan Evans advanced in his.
Boulter took the opening set against US Open champion Naomi Osaka before the world number three hit back to win 3-6 6-3 6-1 in the Gippsland Trophy.
Fifth seed Konta failed to convert two match points in a 4-6 7-6 (12-10) 7-6 (7-4) loss to Irina-Camelia Begu.
Also in Melbourne, Evans reached the third round of the Murray River Open.
The British number one, who had a first-round bye, beat Portugal's Pedro Sousa 6-3 7-5 to set up a meeting with Marcos Giron of the United States.