The second-seeded Osaka, who represents host Japan and is one of the top names at the Games, is returning to competition after she withdrew from the French Open following the first round to take a mental health break.
Osaka holds a 2-1 career edge over Zheng.
The first seeded opponent Osaka could face is No. 16 Kiki Bertens, who is playing the final tournament of her career. Iga Swiatek, the 2020 French Open champion, is a possible quarterfinal opponent for Osaka.
Djokovic is attempting to become the first man to complete a Golden Slam by winning all four major tennis tournaments and an Olympic singles gold medal in the same year.
Djokovic recently won Wimbledon for his 20th career Grand Slam title, after opening the year by winning the Australian and French opens.
Draws were held Thursday, two days before play opens on the hard courts at Ariake Tennis Park.
Barty is also playing doubles with Storm Sanders.
Play begins Saturday.
Read More: Naomi Osaka gets No. 52 Saisai Zheng, Novak Djokovic gets No. 139 Hugo Dellien 2021-07-22 03:09:19