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Retired American track and field star Carl Lewis says South African athletics authorities have "let down" Caster Semenya, 18, amid the row over her sex.
The newly crowned 800m world champion has had medical tests following doubts about whether she is actually female.
Athletics' world governing body (IAAF), demanded the test three weeks the World Championships and Lewis says Semenya should have been withdrawn.
"The South African federation should have dealt with it," said Lewis.
The IAAF ...