An athlete denied gold by a doper in 2012, coming back as clearest of 1xbet favourites to win this time. A runner clocking such fast times, with no suggestion whatsoever of doping herself, that she could smash a questionable world record that has stood for 33 years.
A young woman who was humiliated at her first global championships, coming back to the Olympics as the dominant athlete in her event.
These should all be storylines to cherish. But when Caster Semenya walks into Rio’s Olympic Stadium on Wednesday for the heats of the 800m, she will do so into a scientific and ethical storm that could once again sweep her away.
Semenya became the first black South African woman to win a world track title when she stormed to 800m gold in Berlin seven years ago. That was not the reason her story pushed Usain Bolt from the headlines.