Interviewed by Bild, Alexander Zverev revealed that Laver Cup's Team Europe players have a WhatsApp group, which includes the likes of Roger Federer, Dominic Thiem, Rafael Nadal, Marin Cilic, Tomas Berdych and Zverev.

'Roger is the funniest among everyone, he likes to send jokes and funny videos. You wouldn't believe at it if you don't know Roger. (Nadal) replies instead of sending something. Roger and Rafael have played many important matches against each other, but they get along well.

There is respect,' said Zverev. The 20-year-old also commented on developing his physique. 'I earned more than 16kgs since 2014. Pure muscles, I became faster and stronger, but it also affects my game. Due to the change on clay, I send balls outside the court.' Zverev also added that he can win both, a Grand Slam title and the Davis Cup with the German team.

He also praised the head of German men's tennis Boris Becker. Zverev described Becker as 'a very positive person, one to whom you can listen. I listen to only people whom I trust and you have to listen to Boris.' ALSO READ: Rafael Nadal: 'I won't fight to be No. 1 again. Federer did better than me'