Naomi Osaka to Face Serena Williams in US Open Final 20-year-old Naomi Osaka stunned Madison Keys, 6-2, 6-4 Osaka will play her childhood idol br and 23-time Grand Slam champion br Serena Williams on Saturday. A victory for Serena Williams would draw her even with Margaret Court, Osaka has the opportunity to become the first Japanese woman to win a Grand Slam title in br the Open era.