Tsitsipas says he belongs with Big Three after Finals flourish

LONDON - Stefanos Tsitsipas said he was ready for a breakthrough Grand Slam victory after winning the ATP Finals in London - but a glance at recent history invites caution.

The 21-year-old Greek was in bullish mood after he beat Dominic Thiem, having ousted Roger Federer in the semifinals, to become the season-ending event's youngest winner since 2001.

"I believe I'm really close to being crowned a Grand Slam champion," he said, after his 6-7 (6), 6-2, 7-6 (4) triumph in London on Sunday. "I know these are strong words that I say but I do feel I belong there."