RACHEL SAVAGE CASTER Semenya, the South African double Olympic 800 metres champion, lost her appeal against World Athletics rules that women with high natural testosterone levels must take drugs to reduce them to compete in middle-distance races. Switzerland's top court on Tuesday upheld a 2019 ruling by sport's highest court, the Court of Arbitration, that the global governing body's rules were necessary for fair female competition. WHY DID SEMENYA GO TO COURT? Semenya both wowed and raised eyebrows when she became 800 metres world champion at the age of 18 in 2009, having recorded dramatic improvements in her personal bests.…