The 2020 Olympic Games will be played in 2021 and players like Djokovic, Medvedev and Murray are headlining the entry list into the tennis event. The list is not official and it is a tentative list meaning that it can change at any time. Not many players have committed to playing the event but the list is based on their intentions.
Rafael Nadal is one player who won't be involved announcing his withdrawal from both Tokyo and Wimbledon.
2020 Olympic Games Tennis WTA Entry List with Barty, Osaka and Swiatek (last update 18-07)
The majority of the top of world's tennis will participate at the event and the list headlined by the top 3 (Djokovic, Medvedev and Tsitsipas). Participation is limited to only 4 players per nation so the top four highest-ranked from each country will take part.
While Roger Federer is the latest big name withdrawal with the Swiss legend joining the likes of Nick Kyrgios and Jannik Sinner as recent withdrawals due to an injury setback.
Roger Federer withdraws from 2020 Tokyo Olympic Games: "I unfortunately experienced a setback with my knee"
Andy Murray has been confirmed though to take part due to being the two-time defending gold medallist.
Current Entry List (Update 18-07-2021 - All players confirmed - Berrettini out)
Argentina - Diego Schwartzman, Facundo Bagnis, Federico Coria, Francisco Cerundolo
Australia - John Millman, James Duckworth
Belarus - Egor Gerasimov, Ilya Ivashka
Bolivia - Hugo Dellien
Brazil - Thiago Monteiro, Joao Menezes
Canada - Felix Auger-Aliassime
Chile - Marcelo Tomas Barrios Vera
Chinese Taipei - Yen-Hsun Rendy Lu
Columbia - Daniel Elahi Galan
Croatia - Marin Cilic
Czech Republic - Tomas Machac
Egypt - Mohamed Safwat
France - Gael Monfils, Ugo Humbert, Jeremy Chardy, Gilles Simon
Georgia - Nikoloz Basilashvili
Germany - Alexander Zverev, Jan-Lennard Struff, Dominik Koepfer, Philipp Kohlschreiber
Great Britain - Andy Murray, Liam Broady
Greece - Stefanos Tsitsipas
Hungary - Marton Fucsovics
India - Sumit Nagal
Matteo Berrettini, Lorenzo Sonego, Fabio Fognini, Lorenzo Musetti
Japan - Yoshihito Nishioka, Kei Nishikori, Taro Daniel, Yuichi Sugita
Kazakhstan - Alexander Bublik, Mikhail Kukushkin
Korea Rep - Kwon Soonwoo
Peru - Juan Pablo Varillas
Poland - Hubert Hurkacz, Kamil Majchrzak
Portugal - Joao Sousa, Pedro Sousa
ROC (Russia) - Daniil Medvedev, Andrey Rublev, Aslan Karatsev, Karen Khachanov
Serbia - Novak Djokovic, Miomir Kecmanovic
Slovakia - Norbert Gombos
Spain - Pablo Carreno Busta, Alejandro Davidovich Fokina, Pablo Andujar, Roberto Carballes Baena
USA - Tommy Paul, Frances Tiafoe, Tennys Sandgren, Marcus Giron
Uzbekistan - Denis Istomin