Serena's US Open 2018 final rival was 1 when she 1st won US Open
World number 19 Naomi Osaka, who will face Serena Williams in US Open 2018 final, was just one when the 23-time Grand Slam champion won her first Flushing Meadows title in 1999. Osaka is the first Japanese woman to advance to a Grand Slam final. Osaka and Serena have faced each other once before, with the Japanese emerging as winner.