The 23-year-old Pole saw off the Japanese qualifier 6-0, 6-1 in their second-round match at Flushing Meadows on Thursday.
Up next for the Polish player at the last Grand Slam tournament of the year is the winner between Russia's Anastasia Pavlyuchenkova and Italy's Elisabetta Cocciaretto.
Świątek, a former US Open champion, is playing for her sixth Grand Slam singles title in New York.
The 2024 US Open runs until September 9.
(gs)
Source: Eurosport, PAP