Teenage tennis star and ‘generational talent’ João Fonseca tempering power with patience as he ascends the sport

By George Ramsay, CNN (CNN) — Ever since he first picked up a tennis racket, João Fonseca has shown a penchant for power – even if it came with mixed results. “I was the kind of kid that destroyed the ball,” says Fonseca. “Sometimes, it would go into the fence; sometimes, it would go straight