The opening ceremony is at 8pm Tokyo time (9pm AEST/noon BST/7am EDT) on Friday 23rd July, but the baseball, softball and football competitions began on Wednesday 21st July.
Organizers have repeatedly insisted the competition can be held safely, despite calls for it to be cancelled over coronavirus concerns.
However, the head of the Tokyo 2020 organizing committee has said he is monitoring infection numbers closely, and would hold “discussions” on the Games’ future if necessary.
Officially, the 2020 Summer Olympic Games take place between 23rd July and 8th August but the first events have already begun.
The Paralympic Games are due to run between 24th August and 5th September. The Games were postponed from last year because of Covid.
The Olympics will feature 33 sports at 339 events across 42 venues. The Paralympics will feature 22 sports at 539 events across 21 venues.
Most events are in the Greater Tokyo area, although some football games and the marathon will take place in the northern city of Sapporo.