"I thought it was really cool because they're so flexible and they're also very strong", Osaka said Monday at the Pan Pacific Open.
Despite being in tears on Saturday while receiving the trophy inside the Arthur Ashe Stadium in NY - after Williams' outburst at umpire Carlos Ramos, calling him a "liar" and a "thief" - Osaka said she holds no ill-feelings about what happened.
The 20-year-old Osaka, who's admitted that she doesn't actually drive, doubled her career earnings when she took home the $US3.8 million winner's cheque by beating Serena Williams in last weekend's final.
Osaka beat her childhood idol Serena 6-2, 6-4 in the controversial final of US Open after the veteran received a code violation for coaching.
"I couldn't really pinpoint it at the time, I just felt very overwhelmed".
File: US Open Womens Single champion Naomi Osaka of Japan (L) with Serena Williams of the US during their Women's Singles Finals match at the 2018 US Open at the USTA Billie Jean King National Tennis Center in NY on September 8, 2018.
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Commenting on her new Nissan sponsorship announced in Japan yesterday, Osaka said: "This week has been a dream come to life, and I'm so honoured to represent Japan and Nissan on the world stage".
"I don't feel like I would've liked to savour the moment more - I think I do things my own way and everyone is different in their own way so I don't really have any regrets".
In becoming her country's first ever Grand Slam singles champ, Osaka, the daughter of a Haitian father and Japanese mother, is also helping break new ground in Japan as her bi-racial identity challenges the country's self-image as a racially homogenous society.
Speaking on her speech, she said: "I'm kind of notorious - I'm not that great at trophy ceremonies". "And I think it even shows that I'm a little bit more mature now".
Two years ago she lost in the final to Caroline Wozniacki, who is the top-seeded player this year.
But Osaka, who has shone a light on mixed-race athletes in Japan with her fairytale NY triumph, warned that she is now a completely different player. "'For me, I'm just me, ' she said, when asked whether she represented a 'new Japan". "So, I mean of course having experience helps".