Rio de Janeiro was looking beautiful on the first day of Olympic competition with rowing among the sports to get underway ©Getty Images

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Hungary’s gold medalist Katinka Hosszu poses during the medal ceremony for the Final of the women's 400m individual medley, where she broke the world record ©Getty Images
Hungary’s gold medalist Katinka Hosszu poses during the medal ceremony for the Final of the women's 400m individual medley, where she broke the world record ©Getty Images
Beatriz of Brazil celebrates with fans after Brazil defeated Sweden 5-1 during the Women's Group E ©Getty Images
Beatriz of Brazil celebrates with fans after Brazil defeated Sweden 5-1 during the Women's Group E ©Getty Images
Thailand's Sopita Tanasan cannot believe she has won a gold medal in the women's weightlifting 48kg category ©Getty Images
Thailand's Sopita Tanasan cannot believe she has won a gold medal in the women's weightlifting 48kg category ©Getty Images
It was an historic day for Vietnam as Xuan Vinh Hoang won the country’s first-ever Olympic gold medal in the men’s 10m air pistol ©Getty Images
It was an historic day for Vietnam as Xuan Vinh Hoang won the country’s first-ever Olympic gold medal in the men’s 10m air pistol ©Getty Images
US Secretary of State John Kerry and Frank Schleck of Luxembourg talk before the men's cycling road race ©Getty Images
US Secretary of State John Kerry and Frank Schleck of Luxembourg talk before the men's cycling road race ©Getty Images
A view of the beach volleyball venue at Copacabana as the sun goes down ©Getty Images
A view of the beach volleyball venue at Copacabana as the sun goes down ©Getty Images
Yu Xing of China competes against Italy during the men's team quarter-finals of the archery at the Sambodromo ©Getty Images
Yu Xing of China competes against Italy during the men's team quarter-finals of the archery at the Sambodromo ©Getty Images
Two gold medals were awarded on the first day of the judo competition ©Getty Images
Two gold medals were awarded on the first day of the judo competition ©Getty Images
The first time since Los Angeles 1984 men’s boxing in the Olympics is taking place without head guards ©Getty Images
The first time since Los Angeles 1984 men’s boxing in the Olympics is taking place without head guards ©Getty Images