Garbine Muguruza has beaten Sam Stosur in straight sets , 6 - 2 6 - 4 .
Garbine Muguruza will face either Serena Williams or Kiki Bertens in her second grand slam final tomorrow .
Garbine Muguruza has beaten Sam Stosur in straight sets , 6 - 2 6 - 4 and will face either Serena Williams or Kiki Bertens in her second grand slam final tomorrow .