Portugal competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004. Portuguese athletes have competed at every Summer Olympic Games in the modern era since 1912. The Olympic Committee of Portugal sent the nation's second-largest team to the Games. A total of 81 athletes, 64 men and 17 women, were selected by the committee to participate in 15 sports. Men's football was the only team-based sport in which Portugal had its representation at these Games. There was only a single competitor in badminton, canoeing, equestrian, artistic and trampoline gymnastics, triathlon, and wrestling, which made its official Olympic comeback after an eight-year absence.
Brazil competed at the 1980 Summer Olympics in Moscow, USSR. 106 competitors, 91 men and 15 women, took part in 72 events in 14 sports. Brazilian athletes conquered gold medals again after 24 years, since the 1956 Summer Olympics. Brazil won two gold and two bronze medals in 1980.
Brazil competed at the 1984 Summer Olympics in Los Angeles, United States. 147 competitors, 126 men and 21 women, took part in 82 events in 17 sports. The country set a record with 8 medals – only surpassed in 1996 with 15, but only one medal was gold.
Brazil competed at the 1988 Summer Olympics in Seoul, South Korea. 160 competitors, 127 men and 33 women, took part in 106 events in 21 sports. Brazilians conquered 6 medals in Seoul, but only one gold medal.
Portugal competed at the 2000 Summer Olympics in Sydney, Australia.
Brazil competed at the 1996 Summer Olympics in Atlanta, United States. 225 athletes – 159 men, 66 women – competed in 18 sports. The country set a record with both 15 medals – only surpassed in 2008 – and 3 golds – surpassed in 2004 with five.
Brazil competed at the 1976 Summer Olympics in Montreal, Quebec, Canada. 93 competitors, 86 men and 7 women, took part in 48 events in 12 sports. Brazilians athletes obtained two bronze medals, repeating the same performance of the 1972 Summer Olympics. The sailors, Reinaldo Conrad and Peter Ficker, won the medal in Flying Dutchman. It was the second bronze medal conquered by Reinaldo Conrad after the 1968 Olympics. The jumper João Carlos de Oliveira won the medal in men's triple jump. He was the current record holder from altitude at the 1975 Pan American Games in Mexico City. The winner was two time defending champion Viktor Saneyev from Soviet Union.
Brazil competed at the 1952 Summer Olympics in Helsinki, Finland. 97 competitors, 92 men and 5 women, took part in 51 events in 14 sports. Brazil won three medals at the 1952 Summer Olympics. Brazil won its first gold medal since its debut at the 1920 Summer Olympics.
Brazil competed at the 1956 Summer Olympics in Melbourne, Australia and Stockholm, Sweden. 44 competitors, 43 men and one woman took part in 28 events in 11 sports. The only Brazilian medal was the gold won by Adhemar Ferreira da Silva in men's triple jump. This was his second gold medal in the event. He was the first Brazilian to be a two-time Olympic champion.
Brazil competed at the 1960 Summer Olympics in Rome, Italy. 72 competitors, 71 men and 1 woman, took part in 35 events in 14 sports. Brazilians obtained two bronze medals in Rome. The swimmer Manuel dos Santos was a bronze medalist in men's 100 metre freestyle. The men's basketball team also won the bronze medal. Flagbearer and defending two-time Olympic champion Adhemar Ferreira da Silva could not repeat his performance and placed fourteenth in the triple jump,
Portugal competed at the 2008 Summer Olympics in Beijing, People's Republic of China. It was the nation's twenty-second consecutive appearance at the Olympics. The Olympic Committee of Portugal was represented by a delegation of 129 people, of which 77 were competitors participating in 16 sports. Nelson Évora, the 2007 triple jump world champion, was chosen as the flag bearer during the opening ceremony; he won the triple jump event, giving Portugal its fourth ever Olympic gold medal.
Nigeria competed in the 2008 Summer Olympics which were held in Beijing, People's Republic of China from August 8 to August 24, 2008.
Portugal was represented at the 2009 World Championships in Athletics, held in Berlin from August 15 to August 23, with a delegation of 30 athletes. This delegation matched the record for the biggest national team at the World Championships in Athletics, set at Athens 1997. The team included reigning Olympic and 2007 world triple jump champion Nelson Évora, reigning world indoor champion in the long jump Naide Gomes, and Olympic and World Championships medalist Rui Silva. Veteran race walker and 2005 bronze medalist Susana Feitor accomplished her 10th consecutive appearance at the World Championships. Francis Obikwelu came out of retirement to compete with the 4 × 100 metres relay team.
The United States participated in the 2010 Summer Youth Olympics in Singapore.
Iran competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. The nation has competed at every Summer Olympic games since its official debut in 1948 with the exception of the 1980 and 1984 Summer Olympics. The National Olympic Committee of the Islamic Republic of Iran sent the nation's second-largest delegation to the Games, one less than it sent to Beijing. A total of 53 athletes, 45 men and 8 women, competed in 14 sports. This was also the youngest delegation in Iran's Olympic history, with half the team under the age of 25, and many of them are expected to reach their peak in time for the 2016 Summer Olympics in Rio de Janeiro. Heavyweight boxer Ali Mazaheri was the nation's flag bearer at the opening ceremony.
Uruguay competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. This was the nation's twentieth appearance at the Olympics, Uruguay missed the 1980 Summer Olympics in Moscow, because of its partial support for the United States boycott.
Portugal competed at the 2012 Summer Olympics, held in London, from 27 July to 12 August 2012. The nation celebrated its centennial anniversary participating in the Olympics, having participated at every Summer edition since 1912. The Olympic Committee of Portugal sent a total of 77 athletes to the Games, 45 men and 32 women, to compete in 13 sports. Despite having the same number of athletes as in Beijing, Portugal did not qualify any athletes in archery, fencing and taekwondo.
Brazil will compete at the 2017 World Championships in Athletics in London, United Kingdom, from 4–13 August 2017.
Iran competed at the 2020 Summer Paralympics in Tokyo, Japan, from 24 August to 5 September 2021. This was their ninth consecutive appearance at the Summer Paralympics since 1988.
Indonesia participates in the 2021 Islamic Solidarity Games held in Konya, Turkey from 9 to 18 August 2022, the Games were rescheduled from 20 to 29 August 2021, the event was postponed to be held from 10 to 19 September 2021 in July 2020 by the ISSF because the original dates were coinciding with the 2020 Summer Olympics, which were postponed due to the COVID-19 pandemic. In May 2021, the ISSF postponed the event to August 2022 citing the COVID-19 pandemic situation in the participating countries.
Silver
Spain 
India 
Soviet Union 
Poland 
Cuba 
Tanzania 
