The Americans won't waste any time setting the tone for the women's gymnastics competition.

The reigning world champs and gold medal favorites are up first on vault in Sunday's qualifying session. The Americans do the toughest vaults in the world these days, and how they score will immediately give Russia, Romania and defending Olympic champion China an idea of whether they can catch up or not.

—Nancy Armour — Twitter http://www.twitter.com/nrarmour

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