American Jessica Hardy set a world record of 1min 4.45secs in the 100-metre breaststroke on Friday at the US Open Championship, her second world record in two days.

Hardy broke the previous 100 breaststroke world mark of 1:04.80 set recently by American Rebecca Soni at the World Championships in Rome.

On Thursday, Hardy set a 50m breaststroke world record of 29.95 seconds, breaking the previous mark of 30.09 seconds set last Sunday in Rome by Russia's Yuliya Efimova.

Hardy withdrew from the 2008 US Olympic swimming trials after a positive drug test and was banned from competing for one year.

The International Swimming Federation and the World Anti-Doping Agency have appealed to the Court of Arbitration for Sport seeking to double Hardy's ban.

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