Usain Bolt: Usain Bolt's title defense starts with ease

Photo: Anja Niedringhaus / AP Jamaica's Usain Bolt reacts after finishing first in a heat of the Men's 100m at the World Athletics Championships in Daegu, South Korea, Saturday, Aug. 27, 2011. Photo: Lee Jin-man / AP Jamaica's Usain Bolt reacts afterJamaica's Usain Bolt (left) hugs JAAA President Howard Aris at the JAAA/Puma press conference, which was held at the Daegu Cultural Hall in Daegu, South Korea, on Thursday. - Ricardo Makyn/Staff Photographer DAEGU, South

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