Two Grand Slam champions, a Porsche Macan Turbo as the main prize and a once again sold-out Porsche Arena: The 48th Porsche Tennis Grand Prix is navigating towards a high-class final. Two top stars – Aryna Sabalenka and Jelena Ostapenko – will battle for the Stuttgart title on Monday.Two Grand Slam champions, a Porsche Macan Turbo as the main prize and a once again sold-out Porsche Arena: The 48th Porsche Tennis Grand Prix is navigating towards a high-class final. Two top stars – Aryna Sabalenka and Jelena Ostapenko – will battle for the Stuttgart title on Monday.