The women's 400 meter hurdles came down to a photo finish. Upon entering the finals race, Natalya Antyukh had the fastest qualifying time and was expected to have a podium finish. Lashinda Demus of the US, however, was her number one opponent, having won the 2011 world championships. At the start of the full lap around the track, everyone was evenly spaced. Antyukh didn't wait long before turning on full speed, though. She had a noticeable lead coming into the final hundred.