Story lines: World champion Ye Shiwen (above), 16, helps make China a growing force in the pool; national icon Liu Xiang goes for the hurdles gold he missed out on because of injury in '08.
Don't miss: Diver Qiu Bo, who earned 25 perfect 10s at an international meet in 2011, giving him the highest platform score ever.
Hot button: Underage gymnasts? Not this time.
Outlook: Without home field advantage, China slips a bit from Beijing but continues to build strength in nearly every high-medal sport and challenge the U.S. in the overall standings.