sentences:  At the 2011 World Championships in Daegu, South Korea, Pearson ran a 100m hurdles time of 12.28s (+1.1), the fourth fastest time in history, following the semi-finals where she produced the equal fifth fastest time in history of 12.36s (+0.3) to beat her own Oceanian area record and Australian national record.Coming into the 2012 London Olympics, for the 100m hurdles Pearson had won 32 races from 34 starts.She led the competition after Round 1 heats with 12.57 and lead coming into the final with a semi-final time of 12.39.