The reigning Olympic and worlds champion was visibly having technical problems. On each of his three attempts he hesitated and then ground to a halt after his run-up instead of going into the second phase of his technique.

Britain's Christine Ohuruogu was disqualified from the women's 400m heats due to a false start.

The 27-year-old sprinter triumphed at the Olympic Games three years ago in 49.62 seconds, but came to Daegu with a poor season best of 51.49 seconds.

Another Australian Dani Samuels, a surprise winner two years ago, only narrowly advanced in the women's discus throw while Kenya's world record holder David Rudisha safely went through in the men's 800m event.

The nine-day World Championships, featuring a record 1,945 athletes from 202 countries and regions, officially opened here Saturday night at the 66,422-seat Daegu Stadium.

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