[5] Another U.S. archer secured a spot in the women's individual recurve by winning the mixed team title at the 2019 Pan American Games in Lima, Peru.

[7] Four more U.S. archers were named to the roster for Tokyo 2020 after winning their places in the men's and women's team recurve at the 2021 Final Qualification Tournament in Paris, France.

[12][13] Six marathon runners (three per gender) were the first set of U.S. track and field athletes selected for the Games by virtue of their top three finish at the Olympic Team Trials in Atlanta, Georgia on February 29, 2020.

Apart from Felix and Knighton, the U.S. team also featured three Olympic champions from Rio 2016, namely middle-distance runner Matthew Centrowitz, Jr. (men's 1500 m), hurdler Dalilah Muhammad, and shot put world record holder Ryan Crouser.

[16][17] The fastest American woman in the 100 meters dash Sha'Carri Richardson missed the Olympics due to a positive test for marijuana, two-time pole vault world champion Sam Kendricks was out with COVID-19, 2016 110m hurdles gold medalist Brianna Rollins-McNeal was suspended for missed drug tests, and two-time defending gold medalist and 2019 world champion in triple jump Christian Taylor was out due to injury.

[21] On the men's side, Timothy Lam and Chew brothers Phillip and Ryan received an invitation from the Badminton World Federation to play in the singles and doubles events, respectively, as the next highest-ranked shuttler or pair outside of direct qualifying position.

All of them qualified based on rankings after the 2021 Pan American Boxing Olympic Qualification Tournament, which was due to be held in Buenos Aires, Argentina, was cancelled.

[38] With the cancellation of the 2021 Pan American Championships, the U.S. team accepted the invitation from the ICF to send a canoeist in the men's slalom C-1 to the Games, as the highest-ranked eligible nation from the Americas in the federation's international rankings.

[39] The United States qualified a single boat in the women's C-1 200 m for the Games by winning the gold medal at the 2019 ICF Canoe Sprint World Championships in Szeged, Hungary.

[44] With her golden finish in the women's time trial at the 2019 UCI World Championships, Rio 2016 silver medalist Chloé Dygert Owen was automatically selected to the U.S. road cycling squad for the Games.

[58][59] On January 11, 2020, Lee Kiefer became the first fencer to guarantee selection to the U.S. team for her third consecutive Games, with a dominant number-one position in the national women's foil rankings.

[61] Rio 2016 Olympian Eli Dershwitz, with two-time champion Mariel Zagunis (2004 and 2008) going to her fifth straight Olympics, topped the national men's and women's sabre rankings, respectively, to join the U.S. fencing roster in Tokyo.

[62] Nine more fencers were officially selected to the roster for the rescheduled Games on March 23, 2021, including épée sisters Courtney and Kelley Hurley and Rio 2016 silver medalist Daryl Homer in the men's sabre.

[65] Lee Kiefer scored an upset victory over defending Olympic and world champion Inna Deriglazova of the ROC to win the first ever women's foil gold for the United States.

[70] Xander Schauffele won gold for the United States in the men's tournament with a winning score of −18, holding off a late charge by Slovakia's Rory Sabbatini to emerge victorious by one stroke.

[71] Meanwhile, the men's squad was added to the U.S. gymnastics roster after finishing fourth out of the nations eligible for qualification in the preliminaries of the team all-around at the 2019 World Championships in Stuttgart, Germany.

[72][73] In gymnastics, health concerns caused four-time gold medalist and 19-time world champion Simone Biles to withdraw from the women's team event, in which the U.S. ultimately won the silver medal.

2012 world bronze medalist and defending Pan American Games champion Sakura Kokumai qualified directly for the women's kata category by finishing among the top four karateka at the end of the combined WKF Olympic Rankings.

Amro El-Geziry, a three-time Olympian from Egypt who immigrated to the United States, and rookie Samantha Achterberg secured a selection each in the men's and women's event respectively by virtue of a top-five finish at the 2019 Pan American Games in Lima.

London 2012 Olympian Kara Kohler became the first rower to guarantee her selection on the U.S. team for the rescheduled Games with an outright triumph in the women's single sculls at the first Olympic Trials in Sarasota, Florida, on February 21 to 26, 2021.

[99][100] The U.S. Olympic team were determined based on the sailors' finishing positions, along with the cumulative series scores, from their respective boats at major international regattas in three selection phases: early, middle, and late.

[103] Hence, Rio 2016 Olympian David Hughes, with his partner and skipper Stuart McNay returning to the Olympic regatta for the fourth straight time, was officially nominated to the U.S. sailing team on June 23, 2020.

18-year-old Brooke Raboutou became the first sport climber to be selected to the U.S. team for the Games by advancing to the final of the women's combined event and securing one of the seven provisional berths at the 2019 IFSC World Championships in Hachioji, Japan.

[114][115] Meanwhile, Nathaniel Coleman and Kyra Condie completed the U.S. sport climbing roster by finishing in the top six of those eligible for qualification at the IFSC World Olympic Qualifying Event in Toulouse, France.

With the Grand Slam winner already qualified through the WT Olympic Rankings, London 2012 bronze medalist Paige McPherson secured a spot in the women's welterweight category (67 kg), as the next highest-ranked eligible taekwondo practitioner.

[127] Meanwhile, 2018 Youth Olympic silver medalist Anastasija Zolotic scored a semifinal victory in the women's lightweight category (57 kg) to book the remaining spot on the U.S. taekwondo squad at the 2020 Pan American Qualification Tournament in San José, Costa Rica.

[128][129] American teenager Anastasija Zolotic scored an upset victory over the Russian Olympic Committee's Tatiana Minina in the 57 kg to win the first ever gold medal for the United States in women's taekwondo.

Summary The United States men's national water polo team qualified for the Olympics by winning the gold medal and securing an outright berth at the 2019 Pan American Games in Lima, Peru.

[147] Head coach: Dejan Udovičić[148] Note: Age as of 23 July 2021Source: United States Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine Group play

[163] Head coach: Adam Krikorian[164] Note: Age as of 23 July 2021Source: United States Women | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine Group play