The Latest on the Olympics ahead of the Rio Games (all times local to Rio de Janeiro):
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3:45 p.m.
Four of America's most-decorated track and field stars will try to secure their spots in Rio on Sunday.
Allyson Felix, Justin Gatlin, LaShawn Merritt and Ashton Eaton already have a combined 13 Olympic medals between them.
Felix and Merritt are trying to qualify in the 400 meters, while Gatlin looks to punch his ticket in the 100.
Eaton is well on his way to earning a spot to defend his Olympic decathlon title.