Former tennis Grand Slam champion Bob Hewitt has been found guilty by a South African court of raping underage girls. Hewitt, 75, had denied two charges of rape and a third charge of sexual assault. The attacks took place in the 1980s and 1990s, when the former Australian tennis star was coaching the women, then young girls, in South Africa. Hewitt won nine Grand Slam doubles and six mixed doubles titles in the 1960s and 1970s. During the trial, one woman said she had been sexually assaulted by him when she was 12 years old.