SYDNEY: Kenyan Olympic and world champion David Rudisha will begin his build-up to this year’s Rio Olympics in Australia next month, Athletics Australia said on Thursday. The world 800-metre record holder will compete at the IAAF Melbourne World Challenge and the Perth Track Classic. It will be the 27-year-old’s fifth trip to Melbourne, and his first appearance in Perth. “I’m really looking forward to getting back to Australia, it has played such an important part in my programme over the years,” Rudisha said. Rudisha will be joined in Australia by a fellow Kenyan, the 1500m runner James Magut and Jamaican 400m hurdler Kaliese Spencer in the 400m.