CANBERRA, Jan. 2 (Xinhua) -- Switzerland's top seed Martina Hingis did not sweat to reach the quarter-finals as Chinese ace Li Na was upset by Colombia's Catalina Castano at the Australian Gold Coast Open on Tuesday.

    Hingis did not seem to be firing on all cylinders to get through Nicole Pratt 6-0, 6-1 while the Chinese women's number one lost at 6-4, 1-6, 6-2.

    Hingis, ranked seventh in the world currently, gave the Australian little hope, dominating with her superior movement and speed at the back of the court to book a place in the last eight against Castano.

    Castano moved into the last eight at the expense of sixth seed Li Na.

    Hingis completely outclassed Pratt in the opener before the Australian broke the Swiss player's serve in the first game of the second to give the home crowd some hope.

    But the Swiss, who made her full-time tour comeback after a three-year absence in the 2006 event, hit another gear to shatter the world number 77 in less than an hour.

    Seventh-seeded Katarina Srebotnik of Slovenia also went out, losing 6-3, 6-2 to Russian Elena Vesnina.