Osaka makes her return against Zheng at Tokyo Olympics
Novak Djokovic, of Serbia, in the far court, practices at the Ariake Tennis Center ahead of the 2020 Summer Olympics, Wednesday, July 21, 2021, in Tokyo, Japan. (AP Photo/Alex Brandon)

Novak Djokovic, of Serbia, in the far court, practices at the Ariake Tennis Center ahead of the 2020 Summer Olympics, Wednesday, July 21, 2021, in Tokyo, Japan. (AP Photo/Alex Brandon)

Jul. 21, 2021 07:26 AM EDT
Novak Djokovic, of Serbia, practices at the Ariake Tennis Center ahead of the 2020 Summer Olympics, Wednesday, July 21, 2021, in Tokyo, Japan. (AP Photo/Alex Brandon)

Novak Djokovic, of Serbia, practices at the Ariake Tennis Center ahead of the 2020 Summer Olympics, Wednesday, July 21, 2021, in Tokyo, Japan. (AP Photo/Alex Brandon)

Jul. 21, 2021 06:53 AM EDT
Naomi Osaka, of Japan, practices ahead of the 2020 Summer Olympics at Ariake Tennis Center, Monday, July 19, 2021, in Tokyo. (AP Photo/Kiichiro Sato)

Naomi Osaka, of Japan, practices ahead of the 2020 Summer Olympics at Ariake Tennis Center, Monday, July 19, 2021, in Tokyo. (AP Photo/Kiichiro Sato)

Jul. 19, 2021 01:02 AM EDT
Naomi Osaka, of Japan, practices ahead of the 2020 Summer Olympics at Ariake Tennis Center, Monday, July 19, 2021, in Tokyo. (AP Photo/Kiichiro Sato)

Naomi Osaka, of Japan, practices ahead of the 2020 Summer Olympics at Ariake Tennis Center, Monday, July 19, 2021, in Tokyo. (AP Photo/Kiichiro Sato)

Jul. 19, 2021 01:03 AM EDT
Novak Djokovic, of Serbia, left, practices at the Ariake Tennis Center ahead of the 2020 Summer Olympics, Wednesday, July 21, 2021, in Tokyo, Japan. (AP Photo/Alex Brandon)

Novak Djokovic, of Serbia, left, practices at the Ariake Tennis Center ahead of the 2020 Summer Olympics, Wednesday, July 21, 2021, in Tokyo, Japan. (AP Photo/Alex Brandon)

Jul. 21, 2021 07:27 AM EDT
Naomi Osaka, of Japan, practices ahead of the 2020 Summer Olympics at Ariake Tennis Center, Monday, July 19, 2021, in Tokyo. (AP Photo/Kiichiro Sato)

Naomi Osaka, of Japan, practices ahead of the 2020 Summer Olympics at Ariake Tennis Center, Monday, July 19, 2021, in Tokyo. (AP Photo/Kiichiro Sato)

Jul. 19, 2021 01:05 AM EDT