Roger Federer

Swiss tennis great Roger Federer, who recently became the oldest male to hold the No. 1 seed in the ATP Tour, is known for his humility. But did you know that Federer also has a good sense of humour? Young German star Alexander Zverev (above) revealed that the Laver Cup's Team Europe players have a WhatsApp group, which includes players like Federer, Dominic Thiem, Rafael Nadal, Marin Cilic, Tomas Berdych and himself.