Top-ranked Kim Clijsters has been upset by unseeded Lina Krasnoroutskaya 1-6 6-4 6-1 in the third round of Canadian Open, ending her streak of reaching the semifinals at every tournament this year.

Clijsters moved up to No.1 in the WTA tennis rankings for the first time on Monday, replacing Serena Williams.

The Belgian had made at least the semifinals at the first 14 events she entered in 2003, and she leads the tour with six titles.

Clijsters looked as if she were headed for an easy victory against Krasnoroutskaya, winning the opening set in only 17 minutes. But her unforced errors increased in the next two sets.

Clijsters won a tournament in Carson, California, on Sunday, and she said that meant she didn't have enough time to prepare properly for this hard-court event.

"I just don't think that I had the right preparation. Especially with the travelling," she said.

"But I decided to play. I think today was just one match too much. I just ran out of batteries in the second and the third."

She was playing for the fifth straight week.

In other action today ninth seeded Elena Dementieva beat fifth seed Anastasia Myskina 2-6 6-1 6-1 and Jelena Dokic, seeded eight, lost to 10th seed Vera Zvonareva 6-3 6-2.

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