Beatriz Haddad Maia fell short of the Sao Paulo semi-finals on Friday, while Jelena Ostapenko also exited the Guadalajara Open.
Beatriz Haddad Maia beat Laura Pigossi 6-1 6-4 to book a Sao Paulo Open quarter-final spot, standing firm in the face of a late challenge.
Venus Williams took a set off Karolina Muchova on Monday, but the 45-year-old ultimately exited the US Open in the first round.
Madison Keys became the first big name to fall at the US Open on Monday after she was beaten over three sets by Renata Zarazua.
No matches available.
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