Hamstring injury stops Sally Pearson's track return Sally Pearson is out of action after tearing her hamstring. SALLY Pearson's world title defence has taken a blow after the Olympic 100m hurdles champion tore a hamstring at training. A MRI scan today revealed the Queenslander has a Grade 1 hamstring tear which will force her to shelve her scheduled competitive return at next weekend's Sydney Track Classic. She is also expected to miss her home event on the Australian Athletics Tour, the Brisbane Track Classic on March 23. Pearson's Gold Coast-based team were shocked by the injury, believing she was in perfect shape to begin her quest for a second world title in Moscow in August. "The specialist said it was just bad luck," coach Sharon Hannan said. Pearson was, however, in good spirits, using her Twitter account to vow she would be back on the track soon. Pearson suffered a similar setback in her build-up to last year's Olympic in London. The 26-year-old broke down with a thigh injury at a professional gift race in country Victoria but bounced back to win her first Olympic gold medal. Obviously I am very disappointed. I was genuinely looking forward to competing at the Qantas Australian Athletics Tour in Sydney and being able to run for the many Australian fans that have followed me so closely across the Olympic year and into 2013," Pearson said. The Sydney Track Classic is shaping into a fantastic meet and I will still be coming down to be involved.