Zendaya was “driving [herself] crazy” trying to master tennis for ‘Challengers’. The 27-year-old star had just six weeks to convincingly portray sporting prodigy-turned-coach Tashi Donaldson in her latest movie and admitted she was “incredibly nervous” about the role because her skills were so limited. She told Britain’s HELLO! magazine: “I had no idea about tennis. I knew nothing. “All I really knew of tennis was Venus and Serena [Williams]. “It was terrifying as a challenge to take on because you know you’re supposed to be a great tennis player and I’ve never been a great tennis player. “I w…