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Rules: The top 24 gymnasts in qualification (max. two from each country) compete in the event final. Finalists compete on all four apparatuses, with the highest combined score taking gold.
Defending Olympic Champion: Nastia Liukin, United States
Defending World Champion: Jordyn Wieber, United States
Date: Thursday, August 1
Jordyn Wieber, United States: The reigning world all-around champ doesn't stand out on any particular apparatus, but she's strong in all four rotations and rarely errs.
Gabby Douglas, United States: The outgoing, high-flying Douglas has long been a fan favorite, but it wasn't until she upset Wieber at U.S. Trials that she went from lurking medal contender to front-line favorite. A risk taker who can post gaudy scores when she hits her marks, Douglas will have gymnastics fans everywhere rapt with attention when she takes the floor.
Viktoria Komova, Russia: The uneven bars maestro finished a close second to Wieber at 2011 Worlds despite lingering injury concerns. If healthy, she's the most dangerous threat to U.S. supremacy.
Aliya Mustafina, Russia: After ACL surgery wiped away much of her 2011 season, the 2010 world champ is something of an unknown heading to London. At her best, Mustafina is a wrecking ball of artistry, athleticism and confidence.
Yao Jinnan, China: China's best all-arounder does stellar work on beam and bars. She took bronze at last year's World Championships.
Larissa Iordache, Romania: Romania's best hope for an all-around medal is the only non-Russian, non-American gymnast with a difficulty score in the world's top ten according to the ace bloggers at The All Around. (UPDATE: Iordache has plantar fasciitis and looks iffy for the all-around. Stay tuned.)
Aly Raisman, United States: With only two gymnasts per country permitted in the all-around final, Raisman's toughest task will be qualifying. If she can clear that hurdle, Team USA's most senior member is plenty capable of earning a medal.