New U.S. Open champion Jannik Sinner is making big strides in a short amount of time.
And that, he figures, bodes well for what's to come.
Just 23, Sinner already reached No. 1 in the ATP rankings a few months ago and, on Sunday, collected the second Grand Slam trophy of his career - and of the year - by defeating Taylor Fritz 6-3, 6-4, 7-5 in the final at Flushing Meadows .
Add that to his Australian Open championship in January, and Sinner is the first man since Guillermo Vilas all the way back in 1977 to pick up major titles No. 1 and No. 2 within the same season.
"I've gone through a lot things quickly," said Sinner, Italy's second U.S. Open singles title winner, joining 2015 women's champ Flavia Pennetta. "I'm still young. That gives me confidence I still can get better, because at 23, you haven't perfected everything. So my team and I know we have to improve."
