Naomi Osaka on Monday jumped 12 places to No. 7 in the latest WTA rankings following her historic U.S. Open victory, becoming the highest-ranked Japanese woman since Kimiko Date reached No. 4 in 1995.

The 20-year-old Osaka became the first Japanese woman to claim a Grand Slam crown by outgunning her childhood idol and six-time U.S. Open champion Serena Williams 6-2, 6-4 in a controversy-marred final on Saturday at Flushing Meadows.

At a photo shoot in Manhattan on Sunday, a "very tired" Osaka continued to field questions about the contentious match, in which Williams drew her third penalty with an angry outburst at chair umpire Carlos Ramos, costing her a game when she stood just two games from defeat.

"The thing is, I'm not really sure what happened between Serena and the umpire. And I keep getting asked questions about it, but I'm not too sure," said Osaka, adding that the penalties had not diminished her sense of accomplishment in winning the match.

"For me...I think it's still a win, so I'm just going to count it as that."

Osaka, whose next scheduled tournament is the Toray Pan Pacific Open later this month in Tokyo, said she was still too exhausted to celebrate her U.S. Open win.

"It still doesn't really feel that real. I think right now, what I'm feeling is very tired...so hopefully as that wears off I'll start feeling more happy."

Williams, who received a $17,000 fine for her outburst, jumped 10 places to 16. The 23-time Grand Slam winner continues to climb back following a 13-month maternity absence during which her WTA ranking plummeted to 491.

Romania's Simona Halep and Denmark's Caroline Wozniacki remained Nos. 1 and 2, respectively, while Germany's Angelique Kerber climbed one place to 3.

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