To be eligible, a player must meet certain requirements related to play on
Davis Cup or
Billie Jean King Cup teams. Qualification for the singles competitions is based primarily on the world rankings of 14 June 2021, with 56 players entering each of the men's and women's events (limited to four per
National Olympic Committee (NOC)). Six of the remaining eight slots are to be allocated by continent for NOCs with no other qualifiers. The final two spots are reserved, one for the host nation and one for a previous Olympic gold medalist or Grand Slam champion. In the men's and women's doubles competitions, 32 teams are scheduled to compete. Up to 10 places are reserved for players in the top 10 of the doubles ranking, who could select any player from their NOC ranked in the top 300 in either singles or doubles. The remaining slots are allocated by combined rankings, with preference given to singles players once the total player quota is met. One team per gender is to be reserved for the host nation if none has already become eligible otherwise.
Andy Murray of
Great Britain was the two-time defending champion in men's singles, but withdrew before his first-round match due to a
quadriceps strain.
Monica Puig of
Puerto Rico was the defending champion in women's singles, but did not return to defend her title in order to recover from surgery. The
United States had the most
withdrawals of any nation, with 11. ==Schedule==