Hip operation rules Hewitt out of US Open
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Out of the US Open: Lleyton Hewitt (Getty Images: Ian Walton)
Australian tennis player Lleyton Hewitt will miss next week's US Open after having an operation on his injured hip.
Hewitt has been troubled by the injury all year, but managed to compete in three Grand Slam events, as well as the Beijing Olympics.
He will miss the rest of the season, including Australia's Davis Cup world group play-off tie against Chile next month.
Earlier, Rafael Nadal and Ana Ivanovic, both ranked world number one, were named as the top seeds for the US Open which begins at Flushing Meadows on Monday.
It is the first time that Spaniard Nadal, who replaced Roger Federer at the top of the men's rankings on Monday, has been the top seed at a grand-slam tournament.
Federer, who has won the US Open in each of the past four years, is seeded second, the first time he has not been the top seed in a grand slam since the Australian Open of 2004.
Novak Djokovic, the Australian Open champion and runner-up to Federer last year in New York, is seeded third, with Spaniard David Ferrer fourth.
French Open champion Ivanovic, chasing her first US Open title, heads the women's list for the first time, with fellow Serbian Jelena Jankovic at number two.
Former champion Svetlana Kuznetsova of Russia is seeded three, ahead of American Serena Williams.
Olympic champion Elena Dementieva is seeded fifth, with French Open and Olympic Games runner-up Dinara Safina sixth and Wimbledon champion Venus Williams at seven.
