Russian Kuznetsova won in Key Biscayne in 2006

Top seed Svetlana Kuznetsova was beaten 6-3 6-0 by Marion Bartoli in the fourth round of the Sony Ericsson Open.

Kuznetsova, the 2006 champion, required treatment on a shoulder injury three times during the match and won only eight points in the second set.

Venus Williams lost eight of the first nine games before beating Daniela Hantuchova 1-6 7-5 6-4.

But defending champion Victoria Azarenka is out after losing 6-4 6-0 to Kim Clijsters.

Williams found herself a set and 2-0 down to the Slovakian but rallied to set up a quarter-final meeting against sixth seed Agnieszka Radwanska.

Second seed Caroline Wozniacki also advanced after beating Russian Anastasia Pavlyuchenkova 6-2 6-2 and will next play former world number one Justine Henin.

Thirteenth seed Bartoli of France has won seven of her past 11 matches against top-five players and set up the win when she broke twice in the first set and converted all three of her break-point chances in the second.

Her next opponent will be 12th seed Yanina Wickmayer, who comfortably dismissed Timea Bacsinszky 6-0 6-1.

Kuznetsova revealed after the defeat that she had suffered the injury in her first match of the tournament and it had grown steadily worse.

She said: "It wasn't so bad as today; today was really bad.

"At 5-3 I started to serve and I felt like a pull but I still kept serving. I almost had stars in my eyes it was so painful.

"I called physio and tried to continue to play. I think I should have pulled out earlier. I mean, it's impossible. You know, I cannot return. Then I cannot serve. That was my choice to play."

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