Brazilian outsider Beatriz Haddad Maia toppled World No.1 Iga Swiatek 6-4, 3-6, 7-5 on Thursday to reach the quarter-finals of the WTA Toronto Masters.

The South American, ranked 24th in the world, beat her third top-10 opponent this season, but notched her first career win over a World No.1 as she clawed out the victory in three hours.