On her retirement in May 2008 at the age of just 25 years old Justine Henin was ranked number 1 female tennis player in the world and had been labelled, the best pound for pound tennis player of her generation, by Billie Jean King. Before her retirement she had had a hugely successful career, winning the Australian Open, the US Open twice and the French Open 4 times. On 14th May 2008, after a difficult start to the year in which she had already withdrawn from a competition in Rome blaming fatigue, she announced her retirement from the sport. She said she was not sad because she had concentrated 20 years of her life on tennis and wanted to focus on charity and her tennis school instead. However on 22nd September 2009 a Belgian newspaper announced she would be returning to the sport after just 15 months out, a rumour that she confirmed later that day.