Alexander Zverev fears running out of time as 25-year-old 'not happy' with tennis career
Alexander Zverev has admitted he may be running out of time in tennis if he is to get the success he wants from his career. The German, 25, is currently playing the Madrid Open, where he beat Marin Cilic in the first-round before a walkover win against Lorenzo Musetti. He'll now play Felix Auger-Aliassime in the last eight.