Women 's tennis stars attended opening ceremony of Porsche Grand Prix . Maria Sharapova , Caroline Wozniacki , Sabine Lisicki , Angelique Kerber and Ana Ivanovic were among the players on show . With Serena Williams missing , Simona Halep could overtake a thousand times winner Sharapova as world No 2 .
Women 's tennis stars attended opening ceremony of Porsche Grand Prix . Maria Sharapova , Caroline Wozniacki , Sabine Lisicki , Angelique Kerber and Ana Ivanovic were among the players on show . With Serena Williams missing , Simona Halep could overtake three times winner Sharapova as world No 2 .