Great Britain's Olympic delegation features three sets of twins.
One set of Team GB twins, gymnasts Jennifer and Jessica Gadirova, won a bronze medal.
Twins Laura and Charlotte Tremble of France compete together in synchronized swimming.
Twins Jennifer and Jessica Gadirova won a bronze medal as members of Great Britain's women's gymnastics team.
The 16-year-olds are known for their floor routine prowess. Before the Olympics, they shared what it was like to hear they'd made the team.
"I received my news first," Jess said on a Tokyo 2020 video call. "We were excited for me but still a bit nervous to hear Jen's news, but as soon as we heard hers we were all in tears and just everyone was so excited."
The twins helped Team GB win its first women's team gymnastics Olympic medal since 1928 when they took bronze in the all-round event on Tuesday.
In the men's road race, identical twin cyclists Adam and Simon Yates raced for Great Britain.
The easiest way to tell the identical twins apart is their teeth — Adam's front teeth are straight, while Simon's are angled. Adam also has a scar on his chin, while Adam does not.
"We took different paths, but we're pretty close, and we talk a lot — pretty much every day," Adam told Road Bike Action magazine in 2019.
Adam placed ninth in the road race on July 24, while Simon placed 17th.
Twins Pat and Luke McCormack are members of Great Britain's boxing team.
Pat also competed in Rio in 2016.
"It's unbelievable – I went by myself last time, and it's time for the twins to take over Tokyo," he told The Northern Echo.
Laura and Charlotte Tremble of France compete together in synchronized swimming.
"It's amazing to swim with Laura because when we swim together, we are connected," Charlotte told FINA Aquatics World Magazine in 2019.
Twin sisters Sanne and Lieke Wevers returned to the Olympics on the Netherlands' gymnastics team.
Sanne won a gold medal in balance beam in Rio in 2016.
"Sometimes she is better and sometimes I am better," Sanne said in a 2015 episode of "The Hard Way to Success."
Twins Dina and Arina Averina of Russia compete in rhythmic gymnastics.
This is the 22-year-old Averina sisters' first Olympics.
"When you think that everything is bad and already lost, it's necessary to find strength in yourself and prove first of all to yourself that everything is not lost and that you can," Arina said of her sister Dina in an interview with the Olympic Channel.. "The main thing [is] to fight to the end."
Dina, in turn, praised Arina's self-assurance.
"I like this small kind of indifference from Arina — when everything is bad, or if you are being scolded, you do not have to take it close to heart," Dina said of her sister in an interview with the Olympic Channel. "Do not be so upset, life does not end with this — it is necessary to listen carefully, to analyse it and to go work further. Nothing horrible happened."
Asia and Alice D'Amato are both members of Italy's gymnastics team.
The D'Amato twins both won bronze as part of Team Italy's victory in the 2019 World Championships.
Tokyo is their first Olympics. Italy narrowly missed out on a medal in the women's team all-round, taking fourth place.
Twins Olga and Evgeniia Frolkina played basketball for Russia's Olympic delegation, the ROC.
The Frolkina sisters won silver medals in the women's 3x3 basketball tournament. The US team took gold.
In an interview with the International Basketball Federation, they shared what it's like to be twin athletes.
"We could be tired of each other, but we are so used to being together, so we probably can't bear being without each other now," Olga said.
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