Serena Williams of the United States recieves treatment during the warm up before their Ladies Doubles second round match with Venus Williams against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England

Serena Williams of the United States recieves treatment during the warm up before their Ladies Doubles second round match with Venus Williams against Kristina Barrois of Germany and Stefanie Voegele of Switzerland on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 1, 2014 in London, England

*Women’s tennis world No. 1 Serena Williams has withdrawn from next week’s Swedish Open due to her viral illness.

Williams was forced to pull out of her doubles match with her sister Venus at Wimbledon last week after struggling in the warm-up and requiring treatment from the doctor.

she decided to withdraw from the encounter following the third game after serving four successive double faults and appearing to struggle with her vision.

Williams, who won the Swedish Open last year, said: “I decided not to play in Bastad, because I am still not feeling 100 percent. I want to be in perfect condition to go back on court, but unfortunately it’s not the case. I really hope to be able to get back to training from next week. I want to thank all my fans and the event organizers, for their support and comprehension.

“Bastad was my favourite tournament I played in last year, thus I am very disappointed not to come back there. But there is still next, year, so I can’t wait to go back there.”