Usain Bolt did it again.
The Jamaican won the 100-meter dash for the second Olympics in a row.
Bolt dashed an Olympic record 9.63, which is six-hundredths of a second faster than his time in Beijing. This time he didn't show off until he passed the finish line.
Fellow Jamaican Yohan Black won silver, and American Justin Gatlin won bronze. Gatlin won gold in the 100 meters at the 2004 Athens Olympics.
Special coverage: 2012 London Olympic Games
Source: AP
Editor: Huan CAO
Producer: Flora Yue