Home Naomi Osaka returns the ball during the 2018 U.S. Open Women’s Single’s finals at Arthur Ashe Stadium in Flushing Meadows, NY on Saturday, Sept. 8, 2018.<br>(Photo by Chris Trotman/Getty Image) Naomi Osaka returns the ball during the 2018 U.S. Open Women's Single's finals at Arthur Ashe Stadium in Flushing Meadows, NY on Saturday, Sept. 8, 2018.<br>(Photo by Chris Trotman/Getty Image)

Naomi Osaka returns the ball during the 2018 U.S. Open Women’s Single’s finals at Arthur Ashe Stadium in Flushing Meadows, NY on Saturday, Sept. 8, 2018.
(Photo by Chris Trotman/Getty Image)

Naomi Osaka returns the ball during the 2018 U.S. Open Women’s Single’s finals at Arthur Ashe Stadium in Flushing Meadows, NY on Saturday, Sept. 8, 2018.
(Photo by Chris Trotman/Getty Image)

Serena Williams (R) stands alongside Naomi Osaka after Osaka won the 2018 U.S. Open Women’s Single’s finals at Arthur Ashe Stadium in Flushing Meadows, NY on Saturday, Sept. 8, 2018.<br>(Photo by Chris Trotman/Getty Image)
Naomi Osaka raises the championship trophy after winning the 2018 U.S. Open Women’s Single’s finals at Arthur Ashe Stadium in Flushing Meadows, NY on Saturday, Sept. 8, 2018.<br>(Photo by Chris Trotman/Getty Image)