Swiatek saved four set points and rallied from 1-5 down in the first set
She won six of the next seven games to take control and clinch the match 7-6(2), 6-4
This marks her 20th Grand Slam Round of 16 appearance in just 27 main draws
Swiatek has now reached the last 16 of all four majors in a season for the third time
Haddad Maia became the second South American woman to reach back-to-back US Open last 16s