Serena Williams has pulled out of next week’s WTA Tour event in Stanford, California, due to injury.
Home favourite Teliana Pereira booked a final meeting with Germany's Annika Beck at the Brasil Tennis Cup.
Feliciano Lopez has his resilient serve to thank for a place in the last four of the Swiss Open in Gstaad.
Rafael Nadal had few problems swatting Pablo Cuevas aside as he moved into the last four of the bet-at-home Open.
Top seed Anastasia Pavlyuchenkova needed barely an hour to book her place in the semi-finals of the Baku Cup.
Denis Kudla overcame third seed Jack Sock in straight sets in Atlanta to reach his third ATP World Tour quarter-final.
Rafael Nadal looked closer to his potent best as he beat Jiri Vesely to reach the quarter-finals of the Hamburg Open.
Annika Beck, Teliana Pereira and Bethanie Mattek-Sands all booked their spots in the semi-finals of the Brasil Tennis Cup.
Joao Sousa survived three match points against Denis Istomin to book his place in the quarter-finals of the Swiss Open.
Roger Federer has withdrawn from next month's Rogers Cup in Montreal as he ramps up his preparation for the US Open.