After a five-year wait following their record-breaking victory at the Rio Games, Team USA return to the Olympics with high hopes of another dominant display.
Their wait was extended by 12 months, with the outbreak of the coronavirus pandemic enforcing a year-long postponement.
Regardless, Team USA return as champions, having claimed 121 medals in Rio, becoming only the seventh team in history - and the first since 1948 - to top the medal chart in every category.
Team USA return to the Olympics having won a record-breaking competition at the Rio Games
Their total was also the highest-ever achieved by a Team USA side in a non-boycotted Games, 11 more than their previous record total of 110 from the Beijing Games in 2008.
With a number of athletes retiring since Rio, while others are either injured or failed to qualify for Tokyo, many of Team USA's gold medal stars won't return to defend their hard-earned titles this summer.
There are still an abundance of athletes that will be competing for successive titles, however, and Sportsmail details them all below.
AthleticsDalilah Muhammad (400m hurdles)
Dalilah Muhammad claimed the gold in the 400m hurdles five years ago in Rio, with a time of 53.13 seconds.
The American's team-mate Ashley Spencer also finished on the podium, running a personal-best 53.72 seconds to claim the bronze medal.
Muhammad will face significant competition from team-mate Sydney McLaughlin, who broke her world record when the two raced at the Olympic Trials in June.
Dalilah Muhammad will face strong competition from team-mate Sydney McLaughlin this year
Matthew Centrowitz (1,500m)
Matthew Centrowitz became the first American to win a gold medal in the 1,500m since 1908 when he claimed victory at the Rio Games.
He was also inducted into the University of Oregon Athletics Hall of Fame earlier in 2021.
Finishing with a time of 3:50.00, Centrowitz was in utter disbelief when he crossed the line to claim the gold, afterwards saying: 'I literally was still looking at the board, like, did somebody go by me? Did I really just win?'
Matthew Centrowitz was in disbelief as he claimed 1,500m gold in Rio back in 2016
Men's 4x400m
In what was the final track event of Rio 2016, Team USA claimed gold in the men's 4x400m relay race.
A team of LaShawn Merritt, Gil Roberts, Tony McQuay and Arman Hall completed the race in two minutes 57.30 seconds, ahead of Jamaica in second.
Randolph Ross, Michael Norman, Michael Cherry, Trevor Stewart and Vernon Norwood are included in the pool this year.
Ryan Crouser (shot put)
Ryan Crouser made history in Rio, as he beat Ulf Timmermann's record - set in 1988 - with a monstrous throw of 22.52m to win the gold medal.
And to say he's coming into Tokyo in form would be an understatement.
At the Olympics qualifier last month, Crouser broke the 31-year standing world record with a throw of 23.37 meters. He's going to take some beating this summer.
Women's 4x100m
Team USA claimed the women's 4x100m gold medal at the Rio Olympics with what was the second-fastest time in history at 41.01 seconds.
It was a team of English Gardner, Allyson Felix, Tianna Bartoletta and Tori Bowie who sealed the victory, having nearly crashed out in the heats.
There, they dropped the baton and would have been out if not for a successful appeal, which saw them subsequently run on their own in the Olympic Stadium after arguing they were obstructed.
English Gardner, Aleia Hobbs and Gabby Thomas will compete this year, alongside others who are already selected for individual events.
After nearly crashing out in the heats, Team USA cruised in the women's 4x100m relay final
Women's 4x400m
Team USA also claimed the women's 4x400m gold medal at the Rio Olympics, in what was their sixth straight Olympic title.
A team of Allyson Felix, Phyllis Francis, Natasha Hastings and Courtney Okolo took the victory.
Kendall Ellis, Lynna Irby and Kaylin Whitney will compete this year, alongside others who are already selected for individual events.
BasketballMen's Basketball
Kevin Durant led Team USA to their third successive basketball Olympic gold at the Rio Games.
Though certainly not at their best throughout the competition, they found enough form to emphatically beat Serbia 96-66 in the final.
Team USA won their third-straight gold in the men's basketball event at the Rio Games in 2016
Team USA will be without former head coach Mike Krzyzewski this summer, however, having taken charge for each of their victories at the 2008, 2012 and 2016 Games.
Instead, Gregg Popovich, head coach of the San Antonio Spurs, takes charge.
Women's Basketball
Similarly to the men's team, Team USA's women's basketball team also head into the Tokyo Games as champions and as heavy favourites to claim another gold.
They cruised to gold in Rio five years ago, beating Spain 101-72 to win their sixth straight Olympic title.
Team USA have been in poor form with back-to-back losses in the build-up to the Games, however, though they looked back to their best with a 93-62 win over Nigeria in their final tune-up before the start of the competition.
CyclingConnor Fields (BMX)
Connor Fields became the first American to win the BMX event since its introduction to the Games in 2008 as he took the gold in Rio.
The American fell to his knees in celebration, after defeating the Netherlands' Jelle van Gorkom by 0.684 seconds.
Fields now returns with a wealth of experience aged 28, as opposed to 23 when he won the gold in Rio, which he believes will only make him better this time round.
Connor Fields won America's first-ever BMX Olympic gold medal five years ago in Rio
Simone Biles (All-Around, vault, floor exercise, team)
Simona Biles is nothing other than a sensation. The 24-year-old already has four Olympic gold medals to her name, all won at the Rio Games.
She now has her eyes set on breaking a number of records, some of which she narrowly
