Answer
Sally Pearson was the 100m hurdles world champion in 2011 and 2012. Her personal best time of 12.28 seconds, which she set in 2012, is the second-fastest ever run. However, it was not a world record because it was wind-assisted. The world record for the women's 100m hurdles is 12.20 seconds, set by American Kendra Harrison in 2016.