The 24-year-old U.S. star, considered to be the greatest gymnast of all time, huddled with a trainer after landing her vault. She then exited the competition floor with the team doctor.
AP Photo/Ashley Landis
Biles returned several minutes later with her right leg wrapped. She took off her bar grips, hugged teammates Grace McCallum, Sunisa Lee and Jordan Chiles before putting on a jacket and sweatpants.
The Americans will be forced to finish the rest of the competition without her, severely hampering their bid to claim a third straight Olympic title.
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AP Photo/Gregory Bull
Biles arrived in Tokyo as the unquestioned star of the Games but struggled, at least by her high standards, during qualifying.