Caster Semenya winning the 800 meter race at the 12th IAAF World Championships in Berlin, Germany on August 19, 2009. Her time was more than 2 seconds better than the rest of the field.
Semenya was later asked to undergo a gender verification test, after rumours circulated that she was really a man. After months of investigation, a panel ruled that she could compete as a woman.
Photo credit: WENN.com