New U.S. Open champion Jannik Sinner is making big strides in a short amount of time. 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.