The Young Nadeshiko took the lead through Yuka Momiki’s close-range header on 32 minutes and doubled their advantage just three minutes later after Ueno got onto the end of captain Ruka Norimatsu’s neat pass and slotted past goalkeeper Sandra Chichi.
The 2012 U-20 Women’s World Cup bronze medal winners were cruising after 51 minutes when Momiki notched her second of the game, while Mary Ologbsere’s own-goal just five minutes later piled on the misery for Nigeria.
Ueno recorded her second shortly after the hour-mark, making her way through the Nigerian defence and slotting home from close-range. She completed her hat-trick with a wonder goal eight minutes from time, embarking on a valiant solo run and smashing a powerful strike into the top corner.
Both sides return to Brava Park on 16 November when Japan next face Spain in a top-of-the-group clash, while Nigeria meet Canada.