Brazil's Joao Fonseca, 18, captures Next Gen ATP Finals title with Rafael Nadal watching on
The future is Joao! Eighteen-year-old Brazilian Joao Fonseca completed a perfect week at the Next Gen ATP Finals with a 2-4, 4-3 (8), 4-0, 4-2 victory over American Learner Tien on Sunday, becoming the second-youngest champion in the seven-year history of the competition.