LONDON — Michael Phelps barely qualified in the 400-meter individual medley, Olympic champion Park Tae-hwan was disqualified and world record-holder Paul Biedermann failed to make the final in a surprising first day of swimming at the London Games on Saturday.

Phelps’ slow preliminary time was the biggest shocker of all. The 14-time gold medalist squeaked into the last spot in the eight-man final by seven-hundredths of a second, saying, “That one didn’t feel too good.”

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Queen Elizabeth appeared briefly at the Aquatics Centre, but the biggest buzz involved the big names who struggled.

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South Korea’s Park won his 400 freestyle preliminary heat, but was disqualified for a false start by a judge on the pool deck. The South Koreans filed a protest with the sport’s world governing body, and the 22-member panel it convened annulled the disqualification later Saturday as a result.

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