The Fifteenth Pan American Games begin in Rio de Janeiro, Brazil.
- Official Website
- Two Cuban boxers, Guillermo Rigondeaux Olympic bantamweight champion and amateur welterweight world champion Erislandi Lara, who deserted their team at the 2007 Pan American Games are found in Rio de Janeiro, Brazil and will be sent back to Cuba.
- More than 150 prominent scientists worldwide send a letter to World Health Organization Director-General Margaret Chan calling for the postponement or relocation of the Rio de Janeiro 2016 Summer Olympics because of the widening Zika virus outbreak in Brazil, despite U.S. Centers for Disease Control and Prevention Director Tom Frieden's statement yesterday that "there is no public health reason to cancel or delay the Olympics."
- At least two people are killed after an oceanfront stretch of an elevated bike lane in Rio de Janeiro, Brazil, collapses when it was hit by a strong wave. Two other people were rescued alive, while another may be missing. The bike lane was among the projects built in preparation for the 2016 Summer Olympics. No Olympic event will be held on the path.
- Alleged Brazil serial killer, Sailson Jose das Gracas, confesses to 42 murders in Rio de Janeiro.
- Tens of thousands of Roman Catholics greet Pope Francis in Rio de Janeiro, Brazil, during his first foreign trip as pontiff.