British Andy Murray in action against Japanese Key Nishikori during their Madrid Mutua Open tennis tournament’s semi final match at Caja Magica tennis complex, in Madrid, Spain, 09 May 2015. EPA/CHEMA MOYA

Czech Republic’s Petra Kvitova poses with her trophy after beating Russia’s Svetlana Kuznetsova in their final match at the Mutua Madrid Open tennis tournament in Madrid, Spain, 09 May 2015. EPA/CHEMA MOYA

Spanish tennis player Rafael Nadal serves against Czech Tomas Berdych during their Madrid Mutua Open tennis tournament’s semifinal match at Caja Magica tennis complex, in Madrid, Spain, 09 May 2015. EPA/JUANJO MARTIN

Japanese Key Nishikori in action against British Andy Murray during their Madrid Mutua Open tennis tournament’s semi final match at Caja Magica tennis complex, in Madrid, Spain, 09 May 2015. EPA/JUANJO MARTIN

Kazakhstan’s tennis player Yaroslava Shedova (R) and Australian Cassey Dellacqua (L) pose with the winners’ trophies after defeating to Spanish Garbine Muguruza and Carla Suarez at the Madrid Mutua Open tennis tournament’s female dual final match at Caja Magica tennis complex in Madrid, Spain, 09 May 2015. EPA/CHEMA MOYA