Sydney McLaughlin can get back to the high school homework that's due by 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.
    
AP Photo/Lee Jin-man
 
McLaughlin, a 17-year-old from Dunellen, New Jersey, was fifth in her semifinal Tuesday night at the Rio de Janeiro Games, finishing in 56.22 seconds, as her father watched from the stands wearing a New York Giants shirt. 
The top two runners in each semifinal automatically qualify for the final, along with the top two fastest others. 
   
So McLaughlin's Olympics are over. That's the bad news. The good news is she can focus on the summer reading project that's due before she starts her senior year of high school.
 
"I'm happy I made it this far. I can go home saying, 'I'm an Olympian,'" McLaughlin said. "I guess it's the end of my season _ not the end of my career."