The first complete day of competition on August 6 saw three new swimming world records fall as well as plenty of action in other sports, including judo, road cycling, volleyball, basketball, shooting, and archery.
Rio Olympics, Day 1
The Rio Olympics are now in full swing after the Summer Games were declared officially open on August 5 in Brazil.
![Katinka Hosszu of Hungary competes on her way to winning gold in the women's 400-meter individual medley. ](https://gdb.rferl.org/190fc7d9-8a97-47db-9332-a78a04436ba4_w1024_q10_s.jpg)
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Katinka Hosszu of Hungary competes on her way to winning gold in the women's 400-meter individual medley.
![Katinka Hosszu celebrates shattering the world record in the women's 400-meter individual medley. Her winning time of 4 minutes, 26.36 seconds knocked two seconds off the previous record. ](https://gdb.rferl.org/74790f74-79aa-4a2e-a933-a16bb75ba718_w1024_q10_s.jpg)
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Katinka Hosszu celebrates shattering the world record in the women's 400-meter individual medley. Her winning time of 4 minutes, 26.36 seconds knocked two seconds off the previous record.
![Great Britain's Adam Peaty (center) set a new world record in the men's 100-meter breaststroke heats.](https://gdb.rferl.org/26b44acd-4faa-42ca-a92d-09250ec44074_w1024_q10_s.jpg)
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Great Britain's Adam Peaty (center) set a new world record in the men's 100-meter breaststroke heats.
![Samba dancers pose at the Olympic Aquatics Stadium in Rio.](https://gdb.rferl.org/3b583353-5c67-4b25-a2e1-08c83c2c14f3_w1024_q10_s.jpg)
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Samba dancers pose at the Olympic Aquatics Stadium in Rio.