You know Katie Ledecky, Simone Biles, Allyson Felix and the other household names competing in the Summer Olympics.

Before the opening ceremony Friday marks the official start of the Games, get to know the teenage athletes who could medal in Tokyo and contend for titles for years to come.

1. Katie Grimes, 15 

Country: USA

Event: Swimming

About: At the young age of 15, Katie Grimes was the breakout star at the U.S. Olympic Swim trials. She’ll be competing in the women’s 800-meter freestyle in Tokyo alongside highly-decorated Olympian Katie Ledecky. Grimes is the youngest swimmer to make the Olympic team since Ledecky in 2012. Even Ledecky is already singing Grimes’ praises, saying she’s “the future,” and “the now.”

2. Athing Mu, 19

Country: USA

Event: Track and Field

About: Fresh off of breaking the Olympic Trials track record in the 800-meter dash, Athing Mu is being touted as the country’s next great middle-distance runner. Mu, who competed at Texas A&M before turning pro this summer, holds NCAA records for both the 400 meters (49.57) and the 800 meters (1:57.73). In regards to feeling pressure as a running prodigy, Mu says, “I take everything that people say lightly. I don’t let it get to my head.”

19-year-old @athiiing sets the Trials record and punched her ticket to Tokyo! 🎟@usatf | #TrackFieldTrials21 x #TokyoOlympics pic.twitter.com/luuwJoUHnS

— #TokyoOlympics (@NBCOlympics) June 28, 2021

3. Hannah Roberts, 19

Country: USA

Event: Cycling

About: BMX Cycling is making its Olympic debut in Tokyo, and so is Hannah Roberts. Roberts is a highly decorated star on the BMX freestyle circuit. In 2019, she won all three World Cup events in addition to her second world championship. Roberts is a gold-medal favorite in her event in Japan, and she could become the first teenage woman to win an Olympic cycling medal.

4. Hend Zaza, 12

Country: Syria

Event: Table tennis

About: Representing Syria, 12-year-old Hend Zaza is set to be the youngest Olympian in 52 years. She’s also beating the odds: Zaza has been able to participate in only two or three external matches a year due to war. If you haven’t watched table tennis before, Zaza’s stellar talent will make you want to follow this Olympic sport in Tokyo.

5. Torri Huske, 18

Country: USA

Event: Swimming

About: Having just graduated from high school and heading to Stanford next year, Torri Huske managed to break the 100-meter butterfly record twice at the Olympic swimming trials last month. Twenty-four hours after she broke the U.S. record in prelims by .20 seconds, she broke her own record again. Starting off as a “normal little kid who worked hard,” she will now be one of 11 teenagers to compete for the U.S. swimming team in Tokyo.

6.Grace McCallum, 18

Country: USA

Event: Gymnastics

About: Grace McCallum was named to the four-person team representing the U.S. at the Summer Olympics following the national trials in June, an achievement that seemed nearly impossible when she broke her hand earlier in the year. McCallum, who had already competed at the U.S. Classic and the National Championships, finished fourth at the Olympic Trials. The 18-year-old’s specialties include uneven bars and balance beam.

7. Caroline Marks, 19

Country: USA

Event: Surfing

About: Surfing standout Caroline Marks took the world by storm in 2018. In her breakout year, as the youngest surfer ever to qualify for the Women’s Championship Tour, Marks was named Rookie of The Year and finished with a No. 7 world ranking. Now ranked sixth on the Championship Tour, Marks spoke with Just Women’s Sports about her rapid ascension to the top of her sport.

It's not long before 19-year old @Caroline_Marks3 makes her debut on the global stage. Surf fans everywhere are in for a treat.
Video: Swellshotz pic.twitter.com/ulyQ2E9OJ8

— World Surf League (@wsl) July 16, 2021

8. Kokona Hiraki, 12

Country: Japan

Event: Skateboarding

About: At the age of 12, Kokona Hiraki will be one of the host country’s youngest and most admired stars. After ranking fifth at the final Tokyo Olympics qualifier for women’s park skateboarding, Hiraki will now be the youngest Japanese Summer Olympian ever. Her dedication to her craft is next level: After practicing a nosegrind trick over and over again, Hiraki wrote, “You can feel all the things I love about skateboarding through this trick. The unstableness from being just on the front truck on the coping, the sound of grinding, and the satisfaction when you make it.”

9. Nevin Harrison, 19

Country: USA

Event: Canoeing

About: Canoe sprint world champion Nevin Harrison is heading to the Tokyo Olympics with high expectations. In 2019, she became the first American to win a world sprint canoe title by clinching the women’s C1 200-meter event. Harrison is also a strong advocate for women’s canoeing’s inclusion in the Olympics, saying, “I think it’s more important to have every group represented rather than having a lot in just one gender or discipline,” Harrison said.

10. Sunisa Lee, 18

Country: USA

Event: Gymnastics

About: After coping with family illness, COVID-19 related deaths, and injury, Sunisa Lee claimed a coveted spot on the U.S. women’s gymnastics team by finishing in the top two at the Olympic trials. “It’s the unparalleled mental strength that she has shown during the most difficult time of her life that makes her the person she is,” said 2008 All-Around champion Nastia Liukin. Lee, whose parents emigrated from Laos, will be the first-ever Hmong American Olympic gymnast. While she’s an incredible all-around talent, she’s especially known for her bar routine.

11. Sky Brown, 13

Country: Great Britain

Event: Skateboarding

About: Sky Brown is arguably one of the biggest and brightest stars of any age at this year’s Olympics. At just 13 years and 11 days, she’ll be the youngest Summer Olympian for Great Britain. A fearless and promising athlete, Brown is currently ranked fourth in the world and is highly respected in the skateboarding community. “She could definitely be one of the best female skaters ever… she has such confidence, such force, even at such a young age. The way she’s able to learn new tricks and the way she absorbs direction, it’s so rare,” said skateboarding legend Tony Hawk.

Sky Brown 🇬🇧 wins gold in Women’s Skateboard Park at #XGames 2021! pic.twitter.com/LcGC5OqENB

— X Games (@XGames) July 16, 2021

12. Jessica and Jennifer Gadirova, 16

Country: Great Britain

Event: Gymnastics

About: 16-year-old twin sisters Jessica and Jennifer Gadirova will be each other’s support systems in Tokyo, as they will represent half of Great Britain’s four-person gymnastics team. Jessica flourished at the 2021 European Championships, where she won the bronze in the all-around and silver in vault, and she became the European champion in the floor exercise. Jennifer, a strong vaulter and floor gymnast, is known for her difficult tumbles and eye-catching choreography.

13. Viktoria Listunova, 16

Country: Russia

Event: Gymnastics

About: The postponement of the 2020 Olympics allowed 16-year-old Russian gymnast Viktoria Listunova to be eligible for the 2021 Olympics. “It’s such an opportunity, it is such a big chance,” Listunova says. She is determined to make the most of this opportunity and is considered a possible contender to upset world champion Simone Biles.

14. Rosalie Boissoneault, 18

Country: Canada

Event: Synchronized Swimming

About: A native of Québec, Canada, Rosalie Boissoneault joins the Canadian synchronized swimming team as one of its newest members. She is making her Olympic debut at just 18 years old after joining the senior national team in 2020. Starting in her sport at the age of 3, Boissoneault is a young star looking to make a splash in Tokyo.

15. Rayssa Leal, 12

Country: Brazil

Event: Skateboarding

About: Another young Olympic phenom and friend of Sky Brown is Brazilian skateboarder Rayssa Leal (pronounced “Hi-ee-sa”), known for her many viral trick videos. She is currently second in the World Street Skateboarding rankings. Giving props to her supportive family, Rayssa says, “they don’t pressure me to always win and be first, they encourage me to do what I like, which is skateboarding.”

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16. Regan Smith, 19

Country: USA

Event: Swimming

About:  Regan Smith, the current world-record holder in the women’s 200-meter backstroke, is heading to her first Olympics to represent Team USA. This young star showed off her talent during the World Championships in 2019, where she broke two world records: the 100- and the 200-meter backstroke. Smith will be taking a gap year and plans to attend Stanford in 2022.

17. Brighton Zeuner, 17

Country: USA

Event: Skateboarder

About: Zeuner is coming to the Olympics as a decorated skater with serious competitive chops. She’s the youngest recipient in history to have won two X Games gold medals, and she also holds a Vans Park Series World Championship title. Her great passion and love for skateboarding pushed her to keep going and get her to where she is now. ‘”I love it. Because of skateboarding, I’m kind of who I am. I get validation out of it. It makes me feel human. It’s just a part of me,”’ Zeuner said.

18. Hailey Hernandez, 18

Country: USA

Event: Diving

About: Hailey Hernandez started competing right out of high school and surprised the diving world by placing second in the women’s three-meter springboard at the Olympic trials. “When I hit that water, I knew that I had done it and so I just had the biggest smile on my face,” Hernandez says. Her hometown in Southlake, Texas, threw the two-time World Junior Championship silver medalist an epic Olympic send-off event and will be rooting hard for her this summer.

19. Gaurika Singh, 19

Country: Nepal

Event: Swimming

About: Nepali swimmer Gaurika Singh will represent her country both in the pool and as the flag bearer. The 19-year-old was the youngest athlete at the 2016 Rio Olympics at 13 years and 255 days, and she was chosen to lead the five-member Nepali team in the opening ceremony this year. Singh has collected over nine medals during the South Asian Games and set a record for the most gold medals in 2019.

20. Oceana Mackenzie, 19

Country: Australia

Event: Sport Climbing

About: Australian sport climbing star Oceana Mackenzie will help introduce this new Olympic sport to the world. She started climbing at age of 8 and has been passionate about it ever since. “I love how it’s mentally and physically challenging,” she says. “I have to see the climbs and figure out how to get up them — it’s almost like working out a puzzle.”

Seven-time Olympic gold medalist Katie Ledecky will receive the Presidential Medal of Freedom, the nation's highest civilian honor, at a White House ceremony this afternoon. 

The Team USA standout is the most decorated women’s swimmer in the sport’s history. In addition to her seven Olympic golds, she’s also won a total of 21 gold medals at the World Championships, the most of any swimmer regardless of gender. 

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The esteemed award recognizes those who have "made exemplary contributions to the prosperity, values, or security of the United States, world peace, or other significant societal, public or private endeavors," according to a White House press briefing. 

Ledecky is one of 19 medal recipients chosen by the Biden administration this year. She joins a class that spans the worlds of politics, sports, film, human rights, religion, and science. Her fellow 2024 awardees include Everything Everywhere All at Once actress Michelle Yeoh, pioneering Hispanic astronaut Dr. Ellen Ochoa, and former Speaker of the House Nancy Pelosi, plus posthumous winners Jim Thorpe, the first Native American to win an Olympic gold medal for the US, and assassinated civil rights leader Medgar Evers. 

Olympic gymnast Simone Biles and USWNT legend Megan Rapinoe were among 2022’s class of Presidential Medal of Freedom recipients. Biles and Rapinoe were the fifth and sixth women athletes to be given the honor, making Ledecky the seventh.

After an illustrious career for both club and country, Gotham FC and U.S. Women’s National Team defender Kelley O’Hara announced today via Kelley on the Street that she will be retiring from professional soccer at the end of this year, making the 2024 NWSL season her last.

"I have always said I would play under two conditions: that I still love playing soccer, and if my body would let me do it the way I wanted to," O’Hara told Just Women’s Sports in the lead-up to her retirement announcement. "I realized a while back that I was always going to love it, so it was the physical piece that was going to be the deciding factor."

The 35-year-old will retire as a two-time World Cup champion, an Olympic gold medalist, and at least a two-time NWSL champion, depending on where Gotham finishes this season. Her legacy as a player is hard to fully encapsulate, and will forever run through some of the biggest snapshots in USWNT and NWSL history. 

In 2012, O’Hara played every minute of the USWNT’s Olympic gold medal run, after having recently converted into a defender. Her soaring goal off the bench in the 2015 World Cup semifinal is the stuff of legend. And her return from lingering injury to play in every knockout match of the national team’s 2019 World Cup win cemented a storybook international career. 

It was O’Hara who scored the overtime goal in 2021 to earn the Washington Spirit their first-ever NWSL championship, and O’Hara who returned to help see Gotham earn a title in 2023 after years spent in the trenches with the club’s previous iteration, Sky Blue. Her 15-year career spanned two professional women’s soccer leagues in the U.S. (she earned her first professional title in 2010 with WPS’s FC Gold Pride), as well as sweeping changes to the sport both on and off the pitch.

On the field, O’Hara has always been known for a motor that never quits, making the right flank her domain in attacking possession and defensive transition. In recent years, she’s also been celebrated for a competitive fire that raises the level of her teammates, whether she’s in the starting XI or supporting from the bench.

But injuries take a toll, a reality not always seen by the fans watching from home. "I've never taken anything for granted, and I feel like I've never coasted either," O’Hara said of her late-career success in the NWSL despite battling injuries. "I've always been like, 'I gotta put my best foot forward every single day I step on this field' — which is honestly probably half the reason why I'm having to retire now as opposed to getting a couple more years out of it. I've just grinded hard."

Recently, O’Hara has been sidelined at Gotham with ankle and knee injuries, and the situation motivated her to really prioritize listening to her body. "To get injured and come back, and get injured and come back, and just keep doing it, it really takes a toll on you.

"People don't see the doubt that's associated with injury,” she continued. "As athletes we feel a certain way, we perform a certain way, our body feels a certain way, we're very in tune with our bodies. And there's always so much doubt surrounding injury. It’s like, 'Can I feel the way I felt before?' The reality is sometimes you don't."

O’Hara didn’t arrive at the decision to move on from her playing career lightly. But once she began seriously considering making 2024 her final year during the last NWSL offseason, it felt right. "Once I was like, 'Alright, you know what, this will be my last year,' I have had a lot of peace with it," she said. "Truly the only thing I felt was gratitude for everything that my career has been, all the things I've been able to do and the people I've been able to do it with."

She said she’ll miss daily interactions with her teammates and all the amazing memories they’ve created, though she feels lucky to have formed relationships that go beyond sharing a locker room. "You're basically getting to hang out and just shoot the shit with your best friends every day," she reflected. "Which is so unheard of, and I just feel very lucky to do it for so long."

The Stanford graduate also mentioned that the NWSL’s suspension of regular season play in 2020 due to the Covid-19 pandemic made her realize how much playing allowed her the space to simply be creative every day. The tactical elements of soccer provided O’Hara an outlet for problem solving and made use of her naturally competitive edge.

She’s now gearing up to channel her on-field intensity into her post-playing career full time, which is a new chapter she’s excited to begin. "I don't know if the world's ready for it, like the fact that I'm not going to be putting all of my energy into football all the time," she said with a laugh. 

O’Hara said she would like to stay connected to the game in some fashion, whether it be as an owner, coach, or member of a front office. She’s also interested in the growing media space surrounding women’s sports, having provided on-camera analysis for broadcasters like CBS Sports in addition to starting a production company with her fiancée.

"I just feel like I have a lot of passions, and things that excite me," she says. "And I do want to stay as close as I can to the game, because I feel a responsibility — and I'm not sure in what capacity — to continue to grow it."

A sense of responsibility to grow the game has been a consistent refrain for the USWNT and NWSL players of O’Hara’s era, who ushered in a new age of equal pay for the national team and collectively bargained protections for those in the league. The landscape for new players looks different than it did 14 years ago, in large part due to this pivotal generation.

"I feel an immense sense of pride around that, because I don't know if any of us knew that was gonna happen," she said. "We kind of, as things unfolded, took the next step towards changing what women's football looks like in this country and around the world.

"I'm really grateful to have been part of this era with the players that I was [with], not backing down and pushing and knowing that was the right thing to do."

Whatever the future holds, O’Hara is going ahead full throttle. It’s a piece of advice she’d also give to the next generation of professionals looking to make their own impact.

"Whatever you do in life, do it because you love it, and the chips will fall in place," she said. "If you love something, you're willing to do what it takes. You're willing to make the sacrifices, you're willing to handle the roller coaster.

"To me, it's simple. Don't do it for any other reason but that, and I think you'll be alright."

The Phoenix Mercury center spoke with Robin Roberts about her 10-month incarceration, reflecting on her poor living conditions and shaky mental state ahead of her May 7th memoir.

"The mattress had a huge blood stain on it. I had no soap, no toilet paper," Griner told the ABC News anchor in last night’s 20/20 special. "That was the moment where I just felt less than a human." 

She also detailed some of her lowest moments during that time, saying with tears in her eyes that she went so far as to consider taking her own life on more than one occasion. However, the thought of Russian officials not releasing her body back to her family made her reconsider.

"I just didn't think I could get through what I needed to get through," said Griner.

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In February 2022, Griner was arrested and charged with drug possession and smuggling by a Russian court after Sheremetyevo International Airport police found vape cartridges containing hashish oil in her luggage. The cartridges were prescribed by Griner’s doctor for chronic pain back in Arizona, where medical marijuana is legal. In the interview, the two-time Olympic gold medalist said she had a "mental lapse" while packing, and never intended to bring the cannabis products with her when she returned to play for UMMC Ekaterinburg.

"It's just so easy to have a mental lapse," Griner said. "Granted, my mental lapse was on a more grand scale. But it doesn't take away from how that can happen." 

She was later sentenced to nine years behind bars after her Russian attorneys advised her to plead guilty the following July. Griner was then sent to a remote penal colony where she was forced to spend her days cutting cloth to make military uniforms. From there, it only got worse.

"Honestly, it just had to happen," she said when asked about her decision to cut off her signature long locks. "We had spiders above my bed making nests.

"My dreads started to freeze," she added. "They would just stay wet and cold and I was getting sick. You've gotta do what you've gotta do to survive."

Shortly after Griner’s initial arrest, the U.S. State Department classified her case as wrongfully detained, escalating its urgency within the government and calling even more attention to the situation. On December 8th, she was freed in a prisoner exchange negotiated by the Biden administration.

While she told Roberts she was "thrilled" when she got the news, she was also very upset about having to leave fellow wrongful detainee Paul Whelan behind. She also continues to carry guilt about her arrest, saying "At the end of the day, it's my fault. And I let everybody down."

Griner’s memoir, Coming Home, hits shelves on May 7th.

"Coming Home begins in a land where my roots developed and is the diary of my heartaches and regrets," Griner told ABC News in an exclusive statement. "But, ultimately, the book is also a story of how my family, my faith, and the support of millions who rallied for my rescue helped me endure a nightmare."

Longtime USWNT fixture Carli Lloyd took to Instagram Wednesday morning to announce that she’s pregnant with her first child. 

"Baby Hollins coming in October 2024!" she wrote. The caption framed a collaged image of baby clothes, an ultrasound photo, and syringes indicating what she described as a "rollercoaster" fertility journey.

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In a Women’s Health story published in tandem with Lloyd’s post, the Fox Sports analyst and correspondent opened up about her struggles with infertility and the lengthy IVF treatments she kept hidden from the public eye.

"Soccer taught me how to work hard, persevere, be resilient, and never give up. I would do whatever it took to prepare, and usually when I prepared, I got results," Lloyd told Women’s Health’s Amanda Lucci. "But I found out that I didn’t know much about this world. I was very naive to think that we wouldn’t have any issues getting pregnant. And so it began."

Lloyd went on to discuss her road to pregnancy in great detail, sharing the highs and lows of the process and expressing gratitude for the care and support her family and medical team provided along the way. She rounded out the piece with a nod toward others navigating the same challenges, encouraging people to share their own pregnancy journeys, painful as they may be.

"My story is currently a happy one, but I know there are other women who are facing challenges in their pregnancy journey. I see you and I understand your pain," she said. "My hope is that more and more women will speak up about this topic, because their stories helped me. I also wish for more resources, funding, and education around fertility treatments. There is much to be done, and I hope I can play a role in helping."

The 41-year-old New Jersey native retired from professional soccer in 2021, closing out her decorated career with 316 international appearances, the second-most in USWNT history, in addition to 134 international goals. A legend on the field, Lloyd walked away from the game with two World Cups, two Olympic gold medals, and two FIFA Player of the Year awards.