Alexander Zverev managed to reach the Grand Slam quarter-finals for the first time at the French Open this year after coming through three consecutive five-set matches. The Spaniard Juan Carlos Ferrero, who was Zverev's coach briefly for a few months until the 2018 Australian Open, told Sport Klub: 'He needs years, experience. I think his camp is putting him (in) pressure to win a Grand Slam, but it's too early, he needs to "grow" on the court, feel the Grand Slam environment... it's a little bit different than ATP Finals. First, because playing on three sets and for an hour at a high level is not like playing for three or more hours in the Slams. His biggest problem is to keep the same intensity like we saw in Paris.'
He also spoke about Dominic Thiem: 'He plays his best here, but I think that can play well on any surface. Especially on hard courts and even on grass, it's not necessary to switch many game styles. He has very strong shots, he goes everywhere.'