(Adds details, sprint winners) LONDON, March 2 (Reuters) - Australia's Rebecca Wiasak overwhelmed Poland's Malgorzata Wojtyra to retain her individual pursuit title in the world track championships at London's velodrome on Wednesday. In the women's team sprint final, reigning champions Jinjie Gong and Tianshi Zhong of China were disqualified having finished ahead of Russia. Anastasia Voinova and Daria Shmeleva were handed the title after judges ruled that one of China's changes illegal. More...