Elena Rybakina stays on course for a second Porsche Tennis Grand Prix title

Quarterfinals day at the Porsche Tennis Grand Prix has given the draw a good shaking up. With a capacity Porsche Arena crowd watching on, two of the four top seeds exited.Quarterfinals day at the Porsche Tennis Grand Prix has given the draw a good shaking up. With a capacity Porsche Arena crowd watching on, two of the four top seeds exited.