Navratilova diagnosed with breast cancer

Tennis star Martina Navratilova has been diagnosed with breast cancer, it has been announced.

The American, who won 18 Grand Slam singles titles including a record nine at Wimbledon, has told People magazine in the US she cried when she found out.

She says a routine mammogram in February revealed a cluster in her left breast.

The 53 year-old will begin six weeks of radiation therapy in May.