Victoria Azarenka withdraws from Cincinnati Open through injury

Victoria Azarenka celebrates victory over Yvonne Meusburger in their Australian Open third round match on January 18, 2014
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Defending champion Victoria Azarenka withdraws from the Cincinnati Open due to a knee injury.

Defending champion Victoria Azarenka has been forced to pull out of the Cincinnati Open due to a knee injury.

The Belarusian suffered the problem last week during her run to the quarter-finals of the Rogers Cup in Montreal.

German world number 44 Mona Barthel has replaced the two-time Grand Slam champion in the main draw.

Barthel is due to face Barbora Zahlavova-Strycova in the opening round of the tournament.

US tennis player Venus Williams celebrates after winning the Dubai Duty Free Tennis Championships on February 22, 2014
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