(CNN)After Friday's showstopping opening ceremony, the Rio 2016 Olympics began with action and drama.
Rio 2016 Olympics: Day 1 as it happened
Day one's highlights included: (Mobile app users can best follow the blog here)
• Aquatic grudge match and records smashed in the pool
• French gymnast suffers horror injury
• U.S. teen Ginny Thrasher wins first gold of Games in women's 10-meter air rifle
Recap all the action below and at our Olympics hub: