Australian Olympian and former BMX World Champion Caroline Buchanan has fired the first warning shot on the road to Rio by winning round one of the UCI BMX Supercross World Cup in Santiago del Estero, Argentina. After finishing second by four one hundredths of a second in yesterday’s time trial, 25-year-old Buchanan returned to the track today to lead every single lap contested from the motos to final, inevitably beating home world time trial champion Mariana Pajon and Dutch rider Laura Smulders in the final.