The player field is stacked! The @mubadalasvc welcomes @serenawilliams, defending champion @madisonkeys, finalist @cocovandey and @mariasharapova to San Jose this summer! (📸: #mubadalasvc) - #wta #tennis #sports #serenawilliams #madisonkeys #cocovandeweghe #mariasharapova #usopen #usopenseries