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World record holder Usain Bolt of Jamaica poses after a news conference ahead of the IAAF World Athletics Championships in Daegu August 25, 2011. REUTERS/Lee Jae-Won

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Bolt back on planet earth, says Greene

DAEGU, South Korea (Reuters) - Maurice Greene thinks that but for a string of withdrawals and bans, Usain Bolt's three-year monopoly on the sprint titles at major championships could have come to an end in the 100 meters in Daegu this weekend.