No.5 seeds Raquel Kops-Jones and Abigail Spears were ousted as the doubles event kicked off on Monday, but World No.4 doubles player Andrea Hlavackova slid through smoothly with Petra Martic.
Angelique Kerber and Maria Kirilenko will play for the first time in the semifinals in Monterrey. They are the second-highest-ranked pair not to have played each other - who's the highest?
The youngest and oldest players in the BNP Paribas Open main draw toughed out three set wins as the first round continued. And somewhere in between, Monica Niculescu was in crushing form.
Monica Niculescu survived triple match point in her first round match and another marathon in the final to capture her first WTA title at the inaugural WTA Brasil Tennis Cup in Florianopolis.
Olga Puchkova won an absolute nail-biter against No.1 seed Venus Williams in the semifinals of the WTA Brasil Tennis Cup on Friday night. Awaiting her in Saturday's final will be Monica Niculescu.
After years of struggles Olga Puchkova is hitting her stride on the WTA again, those big groundstrokes in full flight - and awaiting her in the WTA Brasil Tennis Cup semifinals is Venus Williams.
Venus Williams survived a big test against Garbiñe Muguruza in the second round of the WTA Brasil Tennis Cup on Wednesday night, rallying from 3-1 down in the third to beat the Spaniard.
From glowing raindrops to the WTA stars hitting the fluff off the ball and the most ambitious of fans, check out some of the more artistic photos from on and off the court in Monterrey.
From autograph sessions to crowd interaction over to the press room, the stars of the WTA - including Urszula Radwanska - kept the fans of Monterrey engaged even after their matches.
From Angelique to Ana and Urszula to defending champion Timea, the stars of the WTA have given autograph seekers just what they've been looking for at the Monterrey Open this week.
The Monterrey Open player party had it all - a band, dancers, and of course plenty of WTA stars in attendance. Check out pics of Donna Vekic, Ana Ivanovic, Angelique Kerber and more, here!
The WTA Brasil Tennis Cup had a very exciting last few days, from Olga Puchkova's semifinal upset of Venus Williams to Monica Niculescu's nail-biting win in the final. Come into the gallery...
The stars of the WTA made the last edition of the US National Indoor Tennis Championships a special one over the last week, making appearances off the court and wowing crowds on the court.
It's down to the business end of the Shenzhen Longgang Gemdale Open, and from Stadium court to the practice courts, fans have been treated to some awesome action. Check it out!