Naomi Osaka's return to action highlights Olympic tennis
FILE - Japan's Naomi Osaka holds the Daphne Akhurst Memorial Cup after defeating United States Jennifer Brady in the women's singles final at the Australian Open tennis championship in Melbourne, Australia, in this Saturday, Feb. 20, 2021, file photo. Naomi Osaka was going to be at the center of attention during the Tokyo Olympics no matter what. She is a tennis superstar who owns four Grand Slam titles and is the highest-earning female athlete in the world.(AP Photo/Mark Dadswell, FIle)

FILE - Japan's Naomi Osaka holds the Daphne Akhurst Memorial Cup after defeating United States Jennifer Brady in the women's singles final at the Australian Open tennis championship in Melbourne, Australia, in this Saturday, Feb. 20, 2021, file photo. Naomi Osaka was going to be at the center of attention during the Tokyo Olympics no matter what. She is a tennis superstar who owns four Grand Slam titles and is the highest-earning female athlete in the world.(AP Photo/Mark Dadswell, FIle)

Jul. 04, 2021 12:00 PM EDT
FILE - Serena Williams, left, and Venus Williams of the United States laugh together on the podium after receiving their gold medals in women's doubles at the 2012 Summer Olympics at the All England Lawn Tennis Club in Wimbledon, London, in this Sunday, Aug. 5, 2012, file photo. Serena and Venus Williams, who have a combined nine golds, won't be participating at the Tokyo Games. (AP Photo/Elise Amendola, File)

FILE - Serena Williams, left, and Venus Williams of the United States laugh together on the podium after receiving their gold medals in women's doubles at the 2012 Summer Olympics at the All England Lawn Tennis Club in Wimbledon, London, in this Sunday, Aug. 5, 2012, file photo. Serena and Venus Williams, who have a combined nine golds, won't be participating at the Tokyo Games. (AP Photo/Elise Amendola, File)

Jul. 04, 2021 11:54 AM EDT
FILE - Rafael Nadal of Spain reacts to winning a point against Fernando Gonzalez of Chile during their Gold medal singles tennis match at the Beijing 2008 Olympics in Beijing, in this Sunday, Aug. 17, 2008, file photo. Nadal will not be participating in the Tokyo Games. (AP Photo/Elise Amendola, File)

FILE - Rafael Nadal of Spain reacts to winning a point against Fernando Gonzalez of Chile during their Gold medal singles tennis match at the Beijing 2008 Olympics in Beijing, in this Sunday, Aug. 17, 2008, file photo. Nadal will not be participating in the Tokyo Games. (AP Photo/Elise Amendola, File)

Jul. 04, 2021 11:58 AM EDT
FILE - Andy Murray, of England, smiles as he holds up his gold medal at the 2016 Summer Olympics in Rio de Janeiro, Brazil, in this Sunday, Aug. 14, 2016, file photo. Murray's been through two hip operations and assorted other injuries since he became the first tennis player with multiple Olympic singles golds by winning in 2012 and 2016. His ranking outside the Top 100, but past success — including three Grand Slam trophies — earned him a special spot in the Tokyo field for Britain. “I just hope,” he said, “the body holds up.”(AP Photo/Charles Krupa, File)

FILE - Andy Murray, of England, smiles as he holds up his gold medal at the 2016 Summer Olympics in Rio de Janeiro, Brazil, in this Sunday, Aug. 14, 2016, file photo. Murray's been through two hip operations and assorted other injuries since he became the first tennis player with multiple Olympic singles golds by winning in 2012 and 2016. His ranking outside the Top 100, but past success — including three Grand Slam trophies — earned him a special spot in the Tokyo field for Britain. “I just hope,” he said, “the body holds up.”(AP Photo/Charles Krupa, File)

Jul. 04, 2021 11:49 AM EDT
FILE - Japan's Naomi Osaka serves to United States' Jennifer Brady during the women's singles final at the Australian Open tennis championship in Melbourne, Australia, in this Saturday, Feb. 20, 2021, file photo. Osaka withdrew from the French Open after being fined and publicly reprimanded. She sat out Wimbledon, too. So the Tokyo Games mark her return to competition — and it's an occasion that matters to Osaka, who was born in Japan to a Japanese mother and Haitian father. (AP Photo/Andy Brownbill, File)

FILE - Japan's Naomi Osaka serves to United States' Jennifer Brady during the women's singles final at the Australian Open tennis championship in Melbourne, Australia, in this Saturday, Feb. 20, 2021, file photo. Osaka withdrew from the French Open after being fined and publicly reprimanded. She sat out Wimbledon, too. So the Tokyo Games mark her return to competition — and it's an occasion that matters to Osaka, who was born in Japan to a Japanese mother and Haitian father. (AP Photo/Andy Brownbill, File)

Jul. 04, 2021 11:48 AM EDT
FILE - In this Jan. 22, 2020, file photo, Japan's Naomi Osaka walks into Margaret Court Arena for her second round singles match against China's Zheng Saisai at the Australian Open tennis tournament in Melbourne, Australia. Naomi Osaka is a tennis superstar, the highest-earning female athlete in the world and represents Japan, making her a strong medal contender for the host country. Then, of course, came the series of events that began unfolding less than two months before the July start of the Summer Games.(AP Photo/Andy Brownbill, File)

FILE - In this Jan. 22, 2020, file photo, Japan's Naomi Osaka walks into Margaret Court Arena for her second round singles match against China's Zheng Saisai at the Australian Open tennis tournament in Melbourne, Australia. Naomi Osaka is a tennis superstar, the highest-earning female athlete in the world and represents Japan, making her a strong medal contender for the host country. Then, of course, came the series of events that began unfolding less than two months before the July start of the Summer Games.(AP Photo/Andy Brownbill, File)

Jul. 04, 2021 11:44 AM EDT