Usain Bolt wom 100m final with 9.81s in his 3rd Olympic Games.
He defeated Justin Gatlin and Yohan Blake.
The is the third time for him to win the Olympics gold medal in 100m final.
Usain Bolt first won the gold medal and broke the record in 2008 Beijing Olympics.
One year later, he broke his record again and improved it to 9.58s in German World Championships.