FILE - In this April 8, 2012 file photo, Australia's Anna Meares races to a new world record in the women's 500m time trial at the Track Cycling World Championships in Melbourne, Australia. Meares and fellow cyclist Victoria Pendleton are at the top of their games and ready to write the final chapter of their decade-long rivalry when the Olympic track cycling competition starts on Thursday, Aug. 2, 2012, with the team sprints.(AP Photo/Andrew Brownbill, File)