Top Seed: Pat McCormack
The Englishman has been winning either a gold or a silver medal in literally every event in the last four years.
McCormack, who has lost just twice since 2017, is the current European champion and took silver at the 2019 World Championships.
The southpaw also has the experience of Rio 2016. He beat Ablaikhan Zhussupov of Kazakhstan in the first-round but lost a split decision to the number two seed, Yasniel Toledo of Cuba, in the last 16.
It may not have ended the way he wanted but it will be an extra motivation to right the wrongs when he steps inside the ring in Tokyo.
Most talked about: Andrey Zamkovoy
Zamkovoy fought at the 2012 Olympics and defeated unified welterweight world champion Errol Spence Jr. on his way to winning bronze.
Russia's man also featured in the 2016 Olympics but lost in the opening contest.
He has since won the 2019 World Championships, beating McCormack via split decision.
However, McCormack gained revenge this summer, outpointing Zamkovoy to win the European Olympic Qualification final.
One to watch out for: Vikas Krishan
The 29-year-old from India has won medals at the 2010 Asian Games and 2018 Commonwealth Games.
Having fought twice as a professional in 2019, Krishan returned to the amateur scene and qualified for Tokyo 2020.
It will be his third appearance at the Games, the other two being in Rio and London, making him just the second Indian fighter after Vijender Singh to achieve this.
He originally beat Spence in 2012 only for it to be overturned five hours later due to an appeal by Team USA.
Krishan was docked four points for committing fouls that had gone unnoticed by the referee.
In 2016, he reached the quarter-finals before taking a beating from number two seed Bektemir Melikuziev who went on to win silver.