2) Former Junior World Number 1
Nicknamed Sascha, Zverev held No. 1 ranking in the junior circuit, won the Australian open boys title in 2014, and reached the French open boys final in 2013. He is also the youngest player since Bernard Tomic in 2009 to win a title in the challenger series, when he won the Sparkassen Open in Braunschweig. Like many others, he idolises Roger Federer.