Key dates: Aug. 2, team sprint finals; Aug. 3, keirin finals; Aug. 4, team pursuit finals; Aug. 7, sprint, omnium final events Venue: Olympic Park Big story: Olympic champion and nine-time world champion Victoria Pendleton battles Australian rival and world champion Anna Meares (above) in the sprints, and American Sarah Hammer, who faded under unwanted attention in Beijing when she and track teammates wore masks to protect against polluted air, is ready to star in the omnium. Top U.S. prospects: Besides Hammer, Dottsie Bausch, Lauren Tamayo and Jennie Reed could earn a medal in the team pursuit. Others to watch: Lithuania's Simona Krupeckaite could leave London with multiple medals and is top-ranked in the keirin. Wai Lee of Hong Kong did well in the sprint events at the Olympic test events earlier this year. Little-known fact: The omnium is a new event for the women in the Olympics and is compared to track's heptathlon because it consists of multiple events (six) over two days.