Russia's Lina Krasnoroutskaya produced one of the biggest upsets in recent years on the WTA Tour, defeating new World No. 1 Kim Clijsters to reach the quarterfinals of the Rogers AT&T Cup in Toronto.

Krasnoroutskaya, the 19-year-old ranked No. 41 in the world, recovered from losing the first set to record a famous 1-6, 6-4, 6-1 victory.

"I'm very surprised," said Krasnoroutskaya, whose best performance on the WTA Tour this year was a semifinal in Doha. "I didn't expect it from myself. I had nothing to lose. She's the No. 1 in the world and I just did it."

After Clijsters took the opening set in just 19 minutes, the Belgian looked on course for a routine victory. But, after dropping her serve in the fourth game of the second set having been up 40-15, the 20-year-old Belgian produced a number of unforced errors to allow the Russian back into the match.

Krasnoroutskaya then opened up a 5-2 lead before taking the match into a deciding set and, as Clijsters began to show signs of fatigue, closed out the match by holding to love in the final game.

"I didn't have the best preparation coming into the tournament, but I decided to play and go for it and today I just didn't have the batteries in the second and third sets," said Clijsters, who has failed to reach the semifinals for the first time on the WTA Tour this year. "After coming here from Los Angeles, and the jet lag, it was difficult. But she played very well in the second and third sets and she didn't make any mistakes."
Krasnoroutskaya will now meet Katarina Srebotnik of the Slovak Republic after she defeated Magui Serna in straight sets.