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.
Playing her first match in more than six months after battling a right heel injury, Kaia Kanepi took just 54 minutes to blaze through her opening match at the BNP Paribas Katowice Open.
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?
Ayumi Morita battled back from a 61 41 deficit to win her first round match at the Sony Open Tennis. Elsewhere, Serena Williams' first opponent is now known, and it could be a very tricky one.
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.
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.
Earlier in the week we brought you the best on-court shots from Day 1 of the inaugural BNP Paribas Katowice Open - now have a look at some of the best pics from Day 2, Day 3 and Day 4.
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...
From a photo shoot at the beach to the annual White Party, the stars of the WTA have been enjoying themselves off the court and meeting fans at the Abierto Mexicano TELCEL. See the best pics here.
Fresh off her first WTA title in Hobart, Elena Vesnina visited the Spring Street Fountain on her day off between matches. Elsewhere in Melbourne, players were battling through to the third round.