'I love you', Osaka tells US Open final opponent Serena

Moment of history: Naomi Osaka celebrates her victory over Madison Keys

Naomi Osaka told US Open title opponent Serena Williams "I love you" just moments after she became the first Japanese womam to reach a Grand Slam final.

The 20-year-old breakout star of the tournament swept into the record books and Saturday's championship match against the 23-time major winner with a 6-2, 6-4 win over Madison Keys, the runner-up in 2017.

When asked on court what she told herself as she served for the match, she said: "Don't double fault".

"Why," asked the interviewer. "Serena," replied the charismatic Osaka.

"I love you, Serena," she added before adding "I love you, mom; I love everybody".

Osaka has met and defeated Williams once -- at Miami in March.