World champion Tom Pappas of the United States withdrew from the Olympic decathlon competition on Tuesday after injuring his foot in the pole vault.
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Pappas had been lying fifth after seven events, 390 points behind leader Dmitriy Karpov of Kazakhstan.
The American, who finished fifth at the Sydney Olympics, limped away from the stadium after making one failed attempt at 4.60 metres.
Former world record holder Tomas Dvorak pulled out on Monday after aggravating an Achilles tendon injury during the opening event of the decathlon, the 100 metres.