The semi-finals foretold the dominance of the American team as they each won one of the three semi finals. In the final, Brianna Rollins had already achieved the lead by the first hurdle and by the second hurdle it was clear her closest pursuer was Nia Ali. Sisters Cindy Ofili and Tiffany Porter, American born but competing for Great Britain, their mother's homeland, were even in the third-place position. By the fourth barrier, Kristi Castlin was in a battle for last place with Phylicia George and Cindy Roleder, half a stride behind Rollins. Between the fourth and sixth hurdles, Castlin got rolling, gaining and then passing Pedrya Seymour, Porter and finally over the last hurdle, Ofili. Rollins had a clear one metre victory. On the run in, Castlin came very close to Ali as Ofili gave her best desperate lean.
It was an American sweep. The United States has swept the men's 110 metres hurdles six times, this was the first time for women and the first time the women's event has been swept by any country. It was also the first time that the United States has swept the medals in an Olympic women's track and field event.
The women's 100m Hurdles competition consisted of heats (Round 1), Semifinals and a Final. The fastest competitors from each race in the heats qualified for the Semifinals along with the fastest overall competitors not already qualified that were required to fill the available spaces in the Semifinals. A total of eight competitors qualified for the Final from the Semifinals.
Records
Prior to the competition[update], the existing World and Olympic records were as follows.
