Osaka will rise to No. 3 in the rankings on Monday but said she is not certain whether she will play the French Open, which begins in two weeks in Paris on red clay, a surface on which she has struggled to match her results on hardcourts.
She has quickly become one of the biggest stars in international sports and was the highest paid female athlete over the last year, supplanting Williams on the Forbes list with earnings estimated at $37.4 million.
She and her parents followed the Williams family template as they developed her big serve and power baseline game. As with her role model, she is all but impossible to resist when it is all clicking. She had shaky moments in New York: requiring three sets in four of her seven matches, including a taxing and gripping semifinal victory over American Jennifer Brady.
But Osaka, with help from Fissette, managed to block out the static and produce her most convincing tennis when she needed it most: boldly finding the lines with her serves and running groundstrokes at the critical junctures.
A champion again, she made her point unmistakably on the court and off. The sky, which she gazed at so peacefully on Saturday, is the limit.