Serena Williams has emergency op

Wimbledon champion Serena Williams has undergone emergency surgery following the discovery of a blood clot on her lungs, according to reports in America.

Her spokesperson told People magazine that Williams, 29, received treatment on Monday for a haematoma, suffered as a result of a pulmonary embolism.

“Doctors are continuing to monitor her situation closely to avoid additional complications,” read a statement.

Williams has not played competitively since winning Wimbledon in July 2010.

The American has been unable to compete after cutting her foot on glass in a restaurant when celebrating her Wimbledon triumph.

According to spokesperson Nicole Chabot, Williams underwent emergency treatment for a haematoma she suffered “as a result of treatment for a more critical situation”.

Chabot explained that Williams, a former world number one, was discovered to have been suffering from a pulmonary embolism following her return to Los Angeles.

“She had been in New York for doctor appointments for the ongoing issues with her foot,” added Chabot.

Williams, the current world 11, can count four Wimbledon titles among her 13 Grand Slam victories, making her the sixth most successful Grand Slam player in women’s tennis history.

She has won all four of the world’s top tournaments – the US, French and Australian Opens and Wimbledon – and also won a gold medal at the 2000 Olympics in Sydney.