SHANGHAI — Pool powers Australia and the United States have come out against any further changes in swimsuit rules, amid speculation that governing body FINA could make another switch in 2013.

Since high-tech bodysuits were outlawed at the start of last year, no world records have been set in an Olympic-sized 50-meter pool, and nobody is quite sure what to expect when the pool swimming portion of the world championships open Sunday.

Men have been penalized more under the new rules, with their suits limited to jammers covering the waist down to the knees, while women's suits stretch from the shoulders to the knees.

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Manufacturers want to see men's suits brought in line with the women's wear so they can restore company logos to athletes' chests.

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