Hingis, booed and whistled off Center Court Wednesday after beating Frenchwoman Amelie Mauresmo in a super-charged contest, appeared completely at ease as she stepped on to the same court in front of a sparse morning crowd.

The 18-year-old Swiss was so relaxed in fact that she took her time getting into the match and spent 74 minutes disposing of her 84th-ranked Czech opponent.

After a slow start, Hingis looked set to take control of the match when she won five of six games to claim the opening set and a 1-0 lead in the second.

But after Hrdlickova held her serve the set disintegrated into a series of unforced errors with the two players trading six consecutive breaks.

Level at 4-4 and facing triple break point, Hingis pulled herself together, fought back to hold serve and then broke the 23-year-old Czech to close out the match and join defending French Open champion Arantxa Sanchez Vicario of Spain in the round of 16.

Sanchez Vicario, the seventh seed, advanced easily with a 6-4 6-1 win over Romania's Irina Spirlea.