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The Latest: Youngest US track Olympian since '72 done in Rio

RIO DE JANEIRO (AP) — The Latest on the Olympics in Rio de Janeiro (all times local):

9:55 p.m.

Sydney McLaughlin can get back to the homework that's due before the end of the summer. The youngest U.S. track and field Olympian since 1972 did not advance to the final of the 400-meter hurdles.

McLaughlin, a 17-year-old from Dunellen, New Jersey, was fifth in her 400-meter hurdles semifinal Tuesday night at the Rio Games, finishing in 56.22 seconds.

The top two runners in each semifinal automatically qualify for the final, along with the top two fastest others.