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Kamilia Valieva (CNN Courtesy of NBC Sports)

Fifteen-year-old Russian figure skater Kamila Valieva tested positive for the use of trimetazidine, a banned performance enhancing substance. But she has been allowed to compete in all her events and there is no clarity on what, if any, consequences she or members of the Russian Olympic Team will face.

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Timi Zajc, of Slovenia, prepares to jump during a men's normal hill ski jumping training session at the 2022 Winter Olympics, Friday, Feb. 4, 2022, in Zhangjiakou, China. (AP Photo / Matthias Schrader)

Here’s a look at what to watch, starting Saturday when the women go for gold, from the moment ski jumpers sit on a bar about as high as a 40-story building until they glide over machine-made snow and wait to see how far they flew and how the judges scored their performance.

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United States’ Hilary Knight looks on before a women’s hockey game against the Canada, Oct. 22, 2021, in Allentown, Pa. (AP Photo / Chris Szagola, File)

Hilary Knight, who grew up in north suburban Lake Forest, is making her U.S. women’s hockey record-matching fourth Olympic appearance in which she’s won a gold and two silvers.

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A visitor to the Shougang Park walks past a sculpture for the Beijing Winter Olympics in Beijing, China, Tuesday, Nov. 9, 2021. (AP Photo / Ng Han Guan)

China dismissed the decision by Canada and the United Kingdom to join Washington’s diplomatic boycott of the 2022 Beijing Winter Olympic Games as a “farce.” 

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United States' Kevin Durant (7) celebrates after their win in the men's basketball gold medal game against France at the 2020 Summer Olympics, Saturday, Aug. 7, 2021, in Saitama, Japan. (AP Photo / Luca Bruno)

Nothing about the summer was easy for the U.S. men’s basketball team, and neither was the gold-medal game. The Americans expected nothing less. And in the end, their Olympic reign lives on.

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Gymnast Simone Biles cheers on her teammates at the Tokyo Olympics. (Credit: NBC)

One of the leading doctors for the U.S. Olympic team says star gymnast Simone Biles was right to withdraw from competition after a bout of what gymnasts call the “twisties.” Dr. Mark Hutchinson joins us from Tokyo to share his impressions of the Games so far.

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Coach Laurent Landi embraces Simone Biles, after she exited the team final with apparent injury, at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. (AP Photo / Gregory Bull)

The 2016 Olympic gymnastics champion will return to competition in the balance beam final on Tuesday, a little over a week after stepping away from the meet to focus on her mental health.

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Sunisa Lee, of the United States, finishes on the uneven bars during the artistic gymnastics women’s all-around final at the 2020 Summer Olympics, Thursday, July 29, 2021, in Tokyo. (AP Photo / Ashley Landis)

An American finished atop the podium in the women’s Olympic gymnastics all-around, just like always. Sunisa Lee became the fifth straight American woman to claim the Olympic title on Thursday while defending champion Simone Biles watched from the stands.

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Simone Biles, of the United States, watches gymnasts perform after an apparent injury, at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. Biles withdrew from the team finals. (AP Photo / Ashley Landis)

By pulling on her white sweatsuit in the middle of Tuesday night’s Olympic gymnastics meet, and by doing it with a gold medal hanging in the balance, Simone Biles might very well have redefined the mental health discussion that’s been coursing through sports for the past year.

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Simone Biles, of the United States, waits to perform on the vault during the artistic gymnastics women’s final at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. The American gymnastics superstar has withdrawn the all-around competition to focus on her mental well-being. (AP Photo / Gregory Bull)

Simone Biles will not defend her Olympic title. The American gymnastics superstar withdrew from Thursday’s all-around competition to focus on her mental well-being.

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Simone Biles, of the United States, watches gymnasts perform after an apparent injury, at the 2020 Summer Olympics, Tuesday, July 27, 2021, in Tokyo. Biles withdrew from the team finals. (AP Photo / Ashley Landis)

Simone Biles came to Tokyo as the star of the U.S. Olympic movement and perhaps the Games themselves. It all came to a stunning halt in the women’s gymnastics final on Tuesday night with an uncertain vault.

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Pauline Schaefer-Betz, of Germany, performs her floor exercise routine during the women’s artistic gymnastic qualifications at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo. (AP Photo / Gregory Bull)

For decades, female gymnasts have worn bikini-cut leotards. In qualifying on Sunday, however, the German team instead wore unitards that stretched to their ankles, intending to push back against sexualization of women in gymnastics.

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United States' Lindsey Horan, second from right, celebrates after scoring a goal during a women's soccer match against New Zealand at the 2020 Summer Olympics, Saturday, July 24, 2021, in Saitama, Japan. (AP Photo / Martin Mejia)

After a stunning loss in the opener, the U.S. women’s soccer team vowed to be ruthless against New Zealand. And they rebounded in a big way.

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In this Aug. 9, 2016, file photo, U.S. gymnasts and gold medallists, Simone Biles, left and Gabrielle Douglas celebrate on the podium during the medal ceremony for the artistic gymnastics women's team at the 2016 Summer Olympics in Rio de Janeiro, Brazil. (AP Photo / Julio Cortez, File)

The face of gymnastics in the United States is changing. There are more athletes of color starting — and sticking — in a sport long dominated by white athletes at the highest levels.

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Actors perform during the opening ceremony at the Olympic Stadium at the 2020 Summer Olympics, Friday, July 23, 2021, in Tokyo. (AP Photo / Morry Gash)

Belated and beleaguered, the virus-delayed Tokyo Summer Olympics finally opened Friday with cascading fireworks and made-for-TV choreography that unfolded in a near-empty stadium, a colorful but strangely subdued ceremony that set a striking tone to match a unique pandemic Games.

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This image from video shows the Tokyo Olympics medals. The Games kick off Friday, July 23 and run through Aug. 8. (Credit: Tokyo Olympics)

Some of the Games’ most high-profile moments will incorporate clever examples of “reduce, reuse, recycle,” like medalists standing on 3-D printed podiums made from recycled plastic collected by the Japanese people.