World Athletics 2011: Asafa Powell explains 100m pull-out
Athletics World Championships 2011
Venue: Daegu, South Korea
Dates: 27 August - 4 September
Coverage: Listen live on BBC Radio 5 live, 5 live sports extra and online (UK only), watch daily video highlights on the BBC Sport website (UK only); live text commentary on the finals; watch live on Channel 4
Usain Bolt is now clear favourite for both the 100m and 200m titles
Asafa Powell believes his chances at the London Olympics could have been at risk had he have competed in the 100m at the World Championships.
The 28-year-old Jamaican pulled out of the Daegu event with a groin injury initially suffered in the Diamond League in Birmingham last month.
And he said: "It's a very strong field so I can't go out there with pain and finish way back in the field and maybe not be able to be back for next year.
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