Williams and her partner John Isner will see their first action Sunday when the U.S. plays South Africa, and Spain also plays France on the same day. Serbia, represented by Djokovic and Ana Ivanovic, plays Italy in the only match Monday.
Australia - Bernard Tomic, Ashleigh Barty.
Germany - Tommy Haas, Andrea Petkovic.
Italy - Andreas Seppi, Francesca Schiavone.
Serbia - Novak Djokovic, Ana Ivanovic.
France - Jo-Wilfried Tsonga, Mathilde Johansson.
South Africa - Kevin Anderson, Chanelle Scheepers.
Spain - Fernando Verdasco, Anabel Medina Garrigues.
United States- John Isner, Venus Williams.
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