London Olympics | Men’s 100-meter race

Usain Bolt of Jamaica and James Dasaolu of Great Britain compete in a men’s 100m round one heat. Bolt finished first in his heat and will move on to the next round. Dasaolu also qualified.  (Michael Steele / Getty Images)

Ryan Bailey of the United States, left, wins his 100m heat.  (John G. Mabanglo / EPA)

Rondel Sorrillo of Trinidad and Tobago, Justin Gatlin of the United States and Barakat Mubarak Al-Harthi of Oman, from left, race in a men’s 100m heat. Gatlin and Sorrillo qualified for the next round of competition.  (Michael Steele / Getty Images)

Justin Gatlin of the United States salutes after qualifying in his heat of the men’s 100-meter race.  (Lee Jin-man / Associated Press)

Tyson Gay of the United States prepares for his 100-meter heat. He won to qualify for the next round.  (Matt Slocum / Associated Press)

Tyson Gay of the United States qualifies for next round of 100m race.  (Adrian Dennis / AFP / Getty Images)