Roger Federer has told Alexander Zverev that he won't win a Grand Slam tennis title unless he plays more offensively. Zverev has lost in two finals and two semi-finals over the course of his career and he currently sits second in the ATP's world rankings.

Alexander Zverev wasn't bothered by the criticism he received from tennis great Roger Federer, who said the German's game is too passive. "This is nothing that I don't know. It's quite clear to me that I didn't play the way I want to play.