US Open champion Naomi Osaka is considering withdrawing from the Sydney International after “sulking” during her disappointing semi-final loss in Brisbane.

The world No.5 was weighing up her options for the final week before the Australian Open after displaying her “worst attitude” in the 6-2 6-4 to world No.27 Lesia Tsurenko on Saturday.

“I’m not really sure yet,” Osaka said when asked if she would play in Sydney, a tournament she is expected to headline.