Bolt strikes with lightning fast speed to retain 100m gold

From left, Netherlands' Churandy Martina, United States' Ryan Bailey, Jamaica's Usain Bolt, United States' Justin Gatlin, Jamaica's Yohan Blake, United States' Tyson Gay, Jamaica's Asafa Powell and Trinidad's Richard Thompson compete in the men's 100m final at the 2012 London Olympics on Sunday, August 5, 2012.

From left, Jamaica's Usain Bolt, United States' Justin Gatlin, Jamaica's Yohan Blake, United States' Tyson Gay and Jamaica's Asafa Powell compete in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt, foreground, takes the lead in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt, foreground left, goes to cross the finish line ahead of Jamaica's Yohan Blake, third from right, United States' Tyson Gay, second from right, and Trinidad's Richard Thompson in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt reacts to his win in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt shakes hands with spectators after his win in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt celebrates winning gold in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt celebrates winning gold in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt, left, holds his national flag as teammate Yohan Blake, right, poses with him after Bolt's win in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt reacts to his win in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt reacts to his win in the men's 100m final at the 2012 London Olympics.

Jamaica's Usain Bolt reacts to his win in the men's 100m final at the 2012 London Olympics.