The six-time champion is currently out with injury.
Six-time champion Serena Williams has pulled out of the US Open due to injury.
The American says she needs more time to recover from a torn hamstring.
Williams is the latest high profile player to pull-out of the Grand Slam in New York.
She joins Roger Federer, Rafael Nadal and men's title holder Dominic Thiem on the side-lines.

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