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British diver Tom Daley practices at the FINA Swimming World Championships in Shanghai, China, Friday, July 15, 2011. Ng Han Guan, Associated Press
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U.S. swimmer Ryan Lochte trains at the Gold Coast Aquatic Center on the Gold Coast, Australia, Friday, July 15, 2011. The U.S. swim team are holding a training camp in Australia before the FINA World Championships in Shanghai, China. Steve Holland, Associated Press
By Associated Press

SHANGHAI — Cesar Cielo's doping case overshadowed the preparations of other athletes a day before the opening of the world swimming championships.

Cielo's case will be heard Wednesday by the Court of Arbitration for Sport, four days before the swimming portion of the championships open.

The worlds open with diving women's 3-meter synchro and men's 1-meter springboard preliminaries Saturday.

Swimming's governing body FINA challenged a Brazilian federation decision to give Cielo and three teammates only a warning after he tested positive in May for furosemide, a banned diuretic, and blamed it on a contaminated batch of a food supplement Cielo regularly used.

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The CAS hearing will be held in Shanghai.

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