Now a three-time Olympian, the California native is one of the members trying to defend the 4x400-meter women's relay team title. Also the silver medalist in the 200 in the two previous Olympics, the 26-year-old Felix will attempt to capture the elusive individual gold in the event this time around, as well as race the 100 meter after American teammate Jeneba Tarmoh declined to take part in a run-off for the final spot on the U.S.
2 of 25John W. McDonough/SI
After a prolific junior career, the 19-year-old Bronx, N.Y., resident is now one of the contenders for the all-around gymnastics Olympic gold medal. He placed second at the U.S. Olympic Trials to teammate Danell Leyva, and will have his work cut out for him against Leyva and 2011 world champion Kohei Ichimura of Japan. As teammates, Orozco and Leyva help make up one of the most formidable American squads in several Olympic cycles, and they hope to help the United States medal in three consecutive Games for the first time.
3 of 25Heinz Kluetmeier/SI
With three more medals, the 14-time gold medalist will become the most decorated Olympic athlete of all time. Swimming in seven events in London, the 26-year-old is still in his prime and should contend for a podium finish every time he dives into the pool. He'll go head to head with American teammate Ryan Lochte in the 200- and 400-meter individual medleys.
4 of 25Patrick Smith/Getty Images
The three-time defending NBA scoring champ makes his Olympic debut after competing for Team USA at the 2010 FIBA world championships. At worlds, Durant led the team in scoring (22.8 per game) as it captured its first world championship since 1994. To repeat as Olympic gold medalists and overcome a lack of size and depth in the frontcourt, Team USA will need a big performance from the 23-year-old Durant and his deadly shooting stroke.
5 of 25Peter Read Miller/SI
Following a four-year layoff -- the result of a positive doping test -- Gatlin has looked sharp. The 30-year-old defeated all of his American rivals at U.S. Trials and now has his sights set on Jamaicans Usain Bolt and Yohan Blake in the 100 meter, the event he won the gold medal in at the 2004 Games in Athens.
6 of 25Misha Japaridze/AP
Kerri Walsh, Misty May-Treanor
The two-time defending gold medalists will compete together in their third Olympics. May-Treanor, 34, and Walsh, 33, both took time off in 2009 and 2010, but returned to the professional tour as a tandem in 2011, finishing the year ranked No. 2 behind their chief rivals and likely stiffest competition in London, the world champion Brazilian duo of Juliana Silva and Larissa Franca.
7 of 25Christian Petersen/Getty Images
Along with sprinter Justin Gatlin, the 29-year-old American record holder from Lexington, Ky., is the United States' best hope at knocking off the Jamaican contingent in the men's 100 meter. Though Gatlin edged him at the U.S. Trials in June, Gay appears fully recovered from the hip surgery he underwent a year ago, finishing first in his final Olympic tune-up in Paris in early July.
8 of 25FREDERIC J. BROWN/AFP/GettyImages
The 17-year-old Colorado swimming phenom has big expectations on her shoulders, and so far, she has delivered at every chance. Set to compete in a women's record-high seven events at London -- several of which she's the favorite in -- the 2011 FINA Swimmer of the Year and world record holder in the 200-meter backstroke will look to prove she's not only the future of American swimming, but also its present.
9 of 25Peter Read Miller/SI
A 2011 all-around world champion, the 17-year-old finished second to teammate Gabby Douglas by a razor-thin margin at the U.S. Olympic Trials three weeks ago. Wieber has been a member of the women's national team since 2006, when she was just 10, and she and Douglas will be favored to go 1-2 in London. The only question is, in what order?
10 of 25DANIEL ROLAND/AFP/Getty Images
The best goalkeeper at the 2011 World Cup returns as the No. 1 netminder for the United States. She made headlines earlier this month for a positive drug test, but, due to the nature of the substance, she remains eligible to play in the Olympics. After a disappointing second-place finish in the World Cup, Solo and Team USA have revenge on their mind, and the Olympics should prove to be the prime place to secure reprisal.
11 of 25Streeter Lecka/Getty Images
Lochte defeated rival Michael Phelps in both the 200-meter free and 200 individual medley at the world championships in 2011, making their upcoming duel in the 200 and 400 IM some of the most anticipated Olympic events. The 27-year-old Floridian is the world record holder in the 200 IM and will be a favorite to medal in each of his five events.
12 of 25Erick W. Rasco/SI
Coming off a victory at Wimbledon, her fifth, and 14th overall grand slam tournament title, the younger Williams sister is the odds-on favorite to win the gold medal in the tournament back on the grass courts of the All England Club. An individual Olympic gold medal is about the only award missing from her resume and it should provide plenty of motivation for the 30-year-old. She will also compete in doubles with older sister Venus. They won the 2000 and 2008 gold medals, but missed out in 2004 with Serena having to skip due to injury.
13 of 25Peter Read Miller/SI
The 16-year-old Virginia native has exploded on to the national gymnastics scene after previously being seen as more of a secondary talent. The 2012 all-around trials champ, she should help the favored American team to a gold medal and could take the Olympic all-around title as well.
14 of 25Nathaniel S. Butler/NBAE via Getty Images
The No. 1 overall pick in the 2012 NBA draft out of the University of Kentucky is the lone NBA rookie on Team USA. Just 19 years old, don't expect him to play a key role on the star-laden team, but at 6-foot-10, he will lend size to the depleted American frontcourt as a reserve.
15 of 25Michael ONeill/SI
The No. 1 archer in the world and the first American to win three consecutive World Cups, Ellison is looking to improve on his second-round exit at the 2008 Beijing Games this time around in London. If the 23-year-old Arizonan -- who dons a pink bow in support of breast cancer research -- is to do so, he will surely have to defeat the South Koreans, a dominant power within the sport.
16 of 25Jamie Squire/Getty Images
The 23-year-old Purdue product is the top male diver for the United States. The three-time USA Diving Athlete of the Year award winner will make his second Olympic appearance in 2012. In Beijing, competing in the 10-meter platform individual and synchronized competitions -- the same events in which he'll participate in London -- he placed 10th and fifth, respectively.
17 of 25Bill Frakes/SI
The bronze medalist in the 400 meters in Beijing, she will head to London with the goal of improving her position on the podium. It shouldn't be hard given that she currently holds the fastest time of the year in the event. The Jamaican-born 27-year-old will also pace the two-time defending American gold medal team in the 4x400 relay.
18 of 25Adam Pretty/Getty Images
The captain of the U.S. men's water polo team, the 31-year-old Azevedo is considered one of the best American water polo players ever. The Stanford product helped the United States to the silver in Beijing, losing to Hungary in the final. In London, he'll look to lead the team to gold.
19 of 25John W. McDonough/SI
A Cuban-born gymnast who defected to the United States with his family, Leyva became the youngest member of the U.S. national team in 2009 when he was just 17 years old. In 2011, he was the U.S. national all-around gold medalist and the 2011 world champion on the parallel bars. Most recently, he defeated American teammate John Orozco to take top prize at the U.S. Olympic Trials, and as a high bar specialist, should also compete for gold in that event in London, as well.
20 of 25Jamie Sabau/Getty Images
At 5-foot-8, 350 pounds, the 22-year-old weightlifter will compete in her first Olympics in London in the superheavyweight division. The little sister of New York Jets center Nick Mangold won the junior nationals at 18, after just three months participating in the sport. Her combined clean-and-jerk and snatch personal record of 562.2 pounds will likely not be enough to put her in contention for a medal -- 719 is the women's record -- but she will certainly be an American to watch, especially in her home state of Ohio.
21 of 25Mark J. Terrill/AP
A four-time Olympic medalist, this 33-year-old trap and skeet shooter hailing from Southern California will compete in her fifth Games in 2012. Rhode previously won gold in the double trap in both the 1996 and 2004 Olympics, as well as a bronze in 2000. She also owns a silver from the skeet competition in 2008. In 1996, at 17, she also became the youngest female gold medalist in Olympic shooting history.
22 of 25Clive Brunskill/Getty Images
Making her third Olympic appearance, the 27-year-old Oregon native will attempt to defend her two-time individual fencing sabre gold medal in London. She was also a member of the team sabre bronze-winning American team in Beijing in 2008.
23 of 25Bill Frakes/SI
The collegiate track and field athlete of the year in 2010, Eaton's star has only risen since. The University of Oregon product is the clear-cut favorite to win the decathlon after breaking the 11-year-old world record at the U.S. Olympic Trials in June. Anything less than gold for the 24-year-old would be a bit of a surprise.
24 of 25Al Bello/Getty Images
The reigning world record holder in both the 100- and 200-meter breaststroke, Soni is one of the top American female swimmers. In London, she will attempt to defend her Olympic gold medal in the 200 and improve upon her 100 silver from Beijing. She will also swim the breaststroke leg of the 4x100 medley relay.
25 of 25Nathaniel S. Butler/NBAE via Getty Images
One of the best female basketball players on the planet, the 23-year-old Moore will make her Olympic debut in London. The Minnesota Lynx player, who was taken No. 1 overall in the 2011 WNBA draft, will play under former UConn coach Geno Auriemma while on the court for the heavily favored American team.
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