Maria Sakkari fought off a Coco Gauff fightback to book a place in the final of the BNP Paribas Open at Indian Wells.
World number one Iga Swiatek will take on former world number one Caroline Wozniacki in the BNP Paribas Open quarter-finals at Indian Wells.
Australian Open winner Jannik Sinner continued his unbeaten start to the year with a dominant victory over Thanasi Kokkinakis at Indian Wells.
Simona Halep is free to resume her career after the Court of Arbitration for Sport (CAS) reduced her doping ban from four years to nine months.
The British number one Katie Boulter battled back from a set down to defeat Ukrainian Marta Kostyuk 5-7 6-2 6-2 in the final of the San Diego Open.
Katie Boulter is through to a first WTA 500 semi-final after beating Croatia's Donna Vekic in straight sets at the San Diego Open.