Maria Sharapova defeats fellow Russian Elean Dementieva 6-4 2-6 6-3 at the Stanford Classic in California to set up a semi-final against Agnieszka Radwanska.
Britain's Andy Murray beats Alejandro Falla at the Farmers Classic in Los Angeles, but the top seed has plenty to work on ahead of his semi-final.
Elena Baltacha fails to build on her win over top seed Francesca Schiavone as she loses 6-4 6-0 to Germany's Andrea Petkovic at the Istanbul Cup.
Reigning champion Marion Bartoli advances to the Stanford quarter-finals with a 6-3 6-4 win over former world number one Ana Ivanovic.
British doubles number one Sarah Borwell and her American partner Raquel Kops-Jones are into the semi-finals of the WTA Tour event in California.
Andy Murray survives a second-set wobble to beat Tim Smyczek 6-1 4-6 6-2 and book his place in the Farmers Classic quarter-finals in Los Angeles.
British number one Elena Baltacha causes a major upset at the Istanbul Cup by beating French Open champion Francesca Schiavone.
World number six Elena Dementieva returns from an eight-week injury lay-off with victory over Japan's Kimiko Date Krumm in Stanford, USA.
Jonathan Overend delves into the amicable split between star and his coach
British doubles number one Sarah Borwell and her American partner Raquel Kop-Jones upset top seeds Lisa Raymond and Rennae Stubbs in Stanford, USA.