Tsitsipas began 2019 as a "Next Gen" prospect but ends it as a real grand slam threat next year. Navigating through a two-week grand slam has been too much so far for the younger guard to overcome but unlike last year's 21-year-old winner in London, Alexander Zverev, Tsitsipas already has reached a grand slam semifinal, in Melbourne. "I feel like my game is getting better over time, and I believe I'm really close on being crowned a grand slam champion," said Tsitsipas. The latter is likely best known for also working with 23-time grand slam winner Serena Williams. Stefanos Tsitsipas and Dominic Thiem (front) exchange a hug after their ATP Finals thriller.

Source: CNN November 17, 2019 21:45 UTC