Caster Semenya provided the ideal response to being told she has to take hormone-suppressing drugs or change events if she wants to continue competing as a woman by running the fastest time in the world this year to win the 800 metres in the opening Diamond League meeting of the season in Doha. Two days after the legal judgement which will force her to take medication to reduce her testosterone levels if she wants to be eligible to defend her world title later this year, the two-time Olympic champion did what she does best - powered clear of the field to claim a comprehensive victory in what could prove the last international 800m race of her career. The South African sat on the shoulder of the pacemaker early on before bursting away to cross the line in one minute 54.98 seconds, a meeting record.