World number four Venus Williams has withdrawn from next week's two million-dollar WTA event in Montreal due to a nagging left knee injury, said the American on Friday.
The US veteran also quit this week's Cincinnati Open.
"The pain that I am experiencing in my knee has unfortunately not gone away," the seven-time Grand Slam champion said in a statement.
Venus would have played in Montreal for the first time.
She has not played a top-level singles match since she was eliminated from the Wimbledon quarterfinals by 82nd-ranked Tsvetana Pironkova of Bulgaria on June 29.
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