If you want to what Olympic sized heartbreak looks like, watch this video of Morgan Uceny as she falls during the finals of the 1500m
For perspective on why this was so devastating, Morgan was a prime contender for the gold at last year's world championship when she was clipped and fell during the final, ended her chances at the podium. Less than a month later, Morgan went on to an invitational stacked with the same level of talent as worlds - and won.
For this to happen again at the Olympics is unbelievably cruel. She was again a favorite for gold - to see her land on the track like that will be one of the saddest images of the games for me.