[1] The semi-finals showed all the top athletes were at their best, with the first 5 finalists achieving their personal best, except Sally Pearson who improved the 2012 world leading time, and Nevin Yanıt's new national record for Turkey.

Kellie Wells was solidly in third while Lolo Jones edged Yanit for fourth place.

It was an Olympic record for Pearson, a new personal best for Harper and Wells, equal national record for Yanit in 5th, equal personal best for 6th place Phylicia George and a season best for Jones after a difficult journey from the next to last hurdle four years earlier.

The women's 100m Hurdles competition consisted of heats (Round 1), Semifinals and a Final.

[3] Prior to the competition[update], the existing World and Olympic records were as follows.