Stacey Hymer put up a decent fight but the Australian was unable to sustain the charge in losing her round of 16 Olympic taekwondo battle with Canada's Skylar Park 25-15.

Hymer appeared on the verge of causing an upset in the women's 57kg class when she opened up a 12-6 lead midway through the second of three rounds, converting on some good counter-attacking blows to Park's body.

But five straight kicks to the trunk turned the contest the Canadian's way, the world No.3 taking a 16-12 lead in to the final round.

With time running out, a desperate Hymer tried to land the knockout blow, but Park held firm to move through to the quarter-finals.