Zverev reveals the main reason for his Grand Slam failures

Before the start of the ATP Finals, which he has won twice in his career, Alexander Zverev spoke about the difficulties he encounters during Grand Slam tournaments.

The world No.2, a finalist at this year's French Open, admitted that he tends to lose a lot of energy in his opening rounds at major tournaments: "At the beginning, I play very long matches, which go to five sets against players against whom I perhaps shouldn't play five sets.

At the end of the week, that affects my level of fatigue.

Here (at the Masters), on the contrary, I know that if I don't play my best tennis from the start, I won't have the opportunity to win. Maybe it's a question of mentality that I need to have at Grand Slams too."