1.   Chinese swimmers qualified for only one final and finished last in that.

2.   Only two swimmers qualify for the Olympics in each event.

3.   Organizers have changed the way swimmers qualify for the finals.

4.   Only the eight fastest swimmers qualified for the finals.

5.   Since the top two swimmers qualify for the world championships, Robinson beat Marrs in a swim off.

6.   The eight fastest swimmers qualify for the finals.