Lolo Jones  The most heavily hyped U.S. athlete of the Games,
thanks to her looks and the story of her difficult childhood,
was a media darling. But by the time she raced in the 100-meter
hurdles, a backlash had begun. Then she just missed a medal by
finishing fourth behind two lesser-known American teammates. "I
just feel like a big disappointment," Jones said.  Liu Xiang
The Chinese hurdler is the biggest athlete in the world's
biggest country. But for the second consecutive Games, the 2004
110-meter hurdles gold medalist couldn't complete a race. This
time, he crashed into the first hurdle, went down with an
Achilles injury and could only hop the length of the track to
the finish line.  Jordyn Wieber  It was a mixed London
experience for Wieber. She won gold as part of the Fierce Five
gymnastics team. But Wieber, the defending world all-around
champion, didn't qualify for the event at the Games when she
finished behind teammates Gabby Douglas and Aly Raisman.
(Olympic rules allow for only two competitors