The Latest on the Olympics ahead of the Rio Games (all times local to Rio):
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1:50 p.m.
Matt Grevers may have competed in the last race of his career.
The six-time Olympic medalist qualified for the semifinals of the 200-meter backstroke at the U.S. Olympic swimming trials Thursday, but he knows he's got no chance of actually making the team in that event.
Grevers is considering whether to scratch from the evening session, which would likely mark the end of his storied career even though he's also entered in the 50 freestyle.
Grevers won four golds and six medals overall at the last two Olympics.