File: Caster Semenya will return to the field on Friday night.
JOHANNESBURG - Caster Semenya's fight against the world athletics association continues in Switzerland on Tuesday.
The Olympic champion is fighting to have the association drop its newly proposed regulations on testosterone levels in female athletes.
It wants women athletes with a testosterone level above five nanomoles per litre to undergo hormone therapy to reduce their levels.
Only then will they be eligible to take part in international competitions.
Various local and international sporting figures and organisations have leapt to Semenya's defence.
Her lawyers are accusing the IAAF of using underhand tactics to gain public support.
But the body says it's fighting for fairness.
The hearing continues at the Court of Arbitration for Sport until Friday.