Two of the top three seeds fell Thursday in third-round matches at the National Bank Open in Toronto, with unseeded Beatriz Haddad Maia knocking off No. 1 seed Iga Swiatek and No. 14 Karolina Pliskova taking out third-seeded Maria Sakkari. Haddad Maia, of Brazil, delivered an inspired effort to hang on to defeat the Switzerland’s…