Home Naomi Osaka of Japan reacts during her women’s singles semi-final match against Madison Keys of the U.S. during the 2018 US Open Flushing Meadows, New York City.<br>(Photo by Matthew Stockman/Getty Images) Naomi Osaka of Japan reacts during her women's singles semi-final match against Madison Keys of the U.S. during the 2018 US Open Flushing Meadows, New York City.<br>(Photo by Matthew Stockman/Getty Images)

Naomi Osaka of Japan reacts during her women’s singles semi-final match against Madison Keys of the U.S. during the 2018 US Open Flushing Meadows, New York City.
(Photo by Matthew Stockman/Getty Images)

Naomi Osaka of Japan reacts during her women’s singles semi-final match against Madison Keys of the U.S. during the 2018 US Open Flushing Meadows, New York City.
(Photo by Matthew Stockman/Getty Images)

Naomi Osaka of Japan reacts during her women’s singles semi-final match against Madison Keys of the U.S. during the 2018 US Open Flushing Meadows, New York City.<br>(Photo by Matthew Stockman/Getty Images)
Serena Williams (L) will face Naomi Osaka in the finals at the 2018 US Open at Arthur Ashe Stadium n Flushing Meadows, NY on Saturday, Sept. 8.<br>(Photo by Julian Finney/Getty Images)