Eugene, Oregon — Olympic and world champion Caster Semenya ran 2018’s fastest women’s 800m and American Ronnie Baker spoiled Christian Coleman’s outdoor debut with a wind-assisted 9.78sec in the 100m at the Prefontaine Classic Diamond League meeting on Saturday. Semenya, whose middle-distance running career could be under threat because of a new IAAF hyperandrogenism rule, clocked 1min 55.92sec in a dominant performance as she ran the fastest 800m in the US. The rule, which becomes effective in November, would effectively give Semenya a choice of taking medication to restrict her testosterone level or move to longer distance events. She has not lost an 800m race since 2015. Semenya declined to talk about the rule, saying: "I’m here to perform. To be honest, I’m just an athlete. There is nothing I can do, there is nothing I can say about that." She later revealed that some day she might like to run a marathon. She also said she thought it would be possible to break the 800m world rec...

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