In this photo provided by Puma, Jamaican athlete Usain Bolt (centre), poses for a photograph with women in traditional Korean dress at the Dalgubal Grand Bell in Daegu, South Korea, on Saturday. **************************************************************************, Aug. 20, 2011. (AP Photo/Puma, Chung Sung-Jun) EDITORIAL USE ONLY

Ricardo Makyn/Staff Photographer Daegu - Tyson Gay.

Jamaican sprinters, from left: Nesta Carter, Yohan Blake and Michael Frater, listen to a reporter's questions about whether their teammate Asafa Powell is able to compete in the 100-meter race at the World Championships during a news conference at a cultural centre in Daegu, South Korea, yesterday. *******************************************************************************, Aug. 25, 2011. The World Athletics Championships will run Aug. 27 through Sept. 4 in Daegu. (AP Photo/Matt Dunham)

Jamaican sprinter Michael Frater, (right), speaks on stage, flanked by his fellow sprinter Yohan Blake, during a news conference at a cultural centre in Daegu, South Korea, yesterday. ********************************************************************, Aug. 25, 2011. They will race in the World Athletics Championships which run Aug. 27 through Sept. 4 in Daegu. (AP Photo/Matt Dunham)

A worker pulls cables inside the stadium in Daegu, South Korea, Thursday, Aug. 25, 2011. The World Athletics Championships run Aug. 27 through Sept. 4, 2011 in Daegu. (AP Photo/David J. Phillip)

Ricardo Makyn/Staff Photographer Daegu - Sanya Richards.

Ricardo Makyn/Staff Photographer Daegu - Jarrett

Ricardo Makyn/Staff Photographer Jamaica's Usain Bolt (left) hugs JAA president Howard Aris at the JAAA/Puma press conference held at the Daegu, Daeduk Cultural Hall in Daegu, South Korea yesterday. *************************************************************************on Thursday, August 25, 2011.

Ricardo Makyn/Staff Photographer The JAAA/Puma Press Conference that was held at the Daegu Daeduk Cultural Hall in Daegu,South Korea on Thursday, August 25, 2011.

Ricardo Makyn/Staff Photographer The JAAA/Puma Press Conference that was held at the Daegu Daeduk Cultural Hall in Daegu,South Korea on Thursday, August 25, 2011.