Netherlands' Kiki Bertens returns the ball to Russia's Maria Sharapova during their WTA Madrid Open quarter-final tennis match at the Caja Magica in Madrid

Romania's Simona Halep returns the ball to Czech Republic's Karolina Pliskova during their WTA Madrid Open quarter-final tennis match at the Caja Magica in Madrid

Czech Republic's Karolina Pliskova returns the ball to Romania's Simona Halep during their WTA Madrid Open quarter-final tennis match at the Caja Magica in Madrid

Russia's Maria Sharapova returns the ball to Netherlands' Kiki Bertens during their WTA Madrid Open quarter-final tennis match at the Caja Magica in Madrid